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Chapter 3: Multimedia

How computers mix text, pictures, sound, video and animation to teach, entertain and inform: with real Nepali examples from YouTube, TikTok, games and movies.

1 Introduction

When you watch a video on YouTube, scroll through TikTok, play Free Fire or PUBG, or look at an online newspaper like Online Khabar, you are using multimedia. The word is made of two parts: multi (many) and media (ways of sharing information). So multimedia simply means using many types of media together.

Multimedia is the combination of different forms of content: text, graphics, audio, video and animation: presented together through a computer or digital device to share information in an attractive and effective way.

A single photo is just one medium. But a YouTube lesson that has a teacher's voice (audio), a video of the teacher, text on the screen, diagrams (graphics) and moving arrows (animation) all at once: that is true multimedia.

Real example: A digital advertisement of Ncell on TV uses pictures, background music, a voice-over and moving text all together. That mix is what makes it multimedia.
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Image: The five elements of multimedia coming together
Place your image here (filename: multimedia-intro.png)

2 Applications of Multimedia

Multimedia is used almost everywhere today. Below are the main fields where it is applied.

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Education

E-learning videos, animated lessons and apps like YouTube and Khan Academy make hard topics easy.

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Entertainment

Movies, music, video games, TikTok and Netflix all depend on multimedia.

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Business

Advertisements, presentations, online shopping like Daraz and digital marketing.

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Healthcare

X-ray and MRI images, 3D body models and patient-education videos help doctors.

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Science & Research

Simulations, animated models of atoms or weather, and data visualisation.

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Communication

Video calls on Messenger, Zoom and WhatsApp combine audio and video.

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Training & Simulation

Flight simulators and virtual labs train pilots and drivers safely.

3 Components of Multimedia

Multimedia is built from five basic components. A good multimedia product mixes two or more of these together.

ComponentWhat it isExample
TextLetters, words and numbers shown on screenSubtitles on a YouTube video, headlines in a news app
GraphicsStill pictures, drawings, photos and diagramsA photo, logo or a chart in a presentation
AudioSound such as music, voice or effectsBackground music, a teacher's voice-over
VideoMoving pictures with sound, recorded by cameraA movie clip, a recorded class
AnimationDrawings or models made to moveA cartoon, a moving logo, game characters
Remember: The difference between video and animation is that video is recorded from the real world, while animation is created/drawn on the computer to look like it is moving.

4 2D & 3D Animation Software

Different software is used to make animation. 2D software works with flat drawings (height and width only), while 3D software works with solid models that have depth too.

2D Animation Software3D Animation Software
Adobe Animate (Flash)Autodesk Maya
Toon Boom HarmonyAutodesk 3ds Max
Synfig StudioBlender (free, open-source)
Pencil2DCinema 4D
Good to know: Blender is free and very popular. Big animated films like Toy Story and Frozen were made using 3D animation software.

5 Computer Graphics

Computer graphics is the field of creating, storing and editing pictures, drawings and images using a computer.

Everything visual you see on a screen: icons, photos, posters, game scenes, logos and cartoons: is made using computer graphics. Software like Adobe Photoshop, CorelDRAW, Illustrator and Canva are used to make these graphics.

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Image: Examples of computer graphics (logo, poster, game scene)
Place your image here (filename: computer-graphics.png)

6 Use of Computer Graphics

Computer graphics is used in many fields. Four important ones are:

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CAD

Computer-Aided Design is used by engineers and architects to draw buildings, machines and house plans accurately.

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Web Design

Designing attractive websites with banners, buttons, icons and layouts.

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Digital Art

Artists create paintings, illustrations and posters directly on the computer.

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Video Games

Characters, backgrounds and effects in games like Free Fire are made with graphics.

7 Types of Computer Graphics

There are two main types of computer graphics: raster graphics and vector graphics.

Raster Graphics (Bitmap)

Raster graphics are made up of tiny dots called pixels. Each pixel has a colour, and together they form the picture.

Photos are raster images. The problem is that when you zoom in too much, the picture becomes blurry and you can see the square pixels. Examples: JPEG, PNG, GIF, BMP.

Vector Graphics

Vector graphics are made using mathematical lines, curves and shapes instead of pixels.

Because they use maths, vector images can be zoomed to any size without losing quality. They are best for logos and icons. Examples: SVG, AI, CDR.

Raster GraphicsVector Graphics
Made of pixels (dots)Made of lines and curves (maths)
Becomes blurry when zoomedStays sharp at any size
Large file size for photosUsually smaller file size
Best for photographsBest for logos, icons, text
JPEG, PNG, GIF, BMPSVG, AI, CDR, EPS

8 Graphics File Formats

Images can be saved in many file formats. Each has its own use.

FormatFull Form / TypeBest Used For
TIFF / TIFTagged Image File FormatHigh-quality printing; large file, no quality loss
JPEG / JPGJoint Photographic Experts GroupPhotos on web; small size but some quality loss
GIFGraphics Interchange FormatSimple animations and stickers; only 256 colours
PNGPortable Network GraphicsImages needing a transparent background; good quality
SVGScalable Vector GraphicsLogos and icons that must stay sharp at any size
PDFPortable Document FormatDocuments and graphics that look the same everywhere
Tip: Use JPG for normal photos, PNG when you need a transparent background (like a logo), and GIF for small moving images.

9 Audio & Waveform

Audio is sound: such as music, voice or effects: that has been recorded and stored so a computer can play it.

Sound travels as waves. When sound is recorded, the computer draws it as a waveform: a wavy line that shows how the sound changes over time. A tall wave means a loud sound, and a short wave means a soft sound. Waves close together mean a high pitch, and waves far apart mean a low pitch.

Audio waveform is the visual picture (a wavy line) that represents a sound, showing its loudness (amplitude) and pitch (frequency) over time.
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Image: A sound waveform showing amplitude and frequency
Place your image here (filename: audio-waveform.png)

10 Why Waveform is Needed

The waveform is very useful when working with sound. It is needed because:

  • It lets us see the sound, so we know where it is loud, soft or silent.
  • It makes editing easy: we can cut, copy, delete or join parts of the sound at exactly the right place.
  • It helps remove noise and silent gaps.
  • It helps in mixing music and voice together properly.
  • It shows the quality and timing of the recording.
Example: In software like Audacity, a YouTuber sees the waveform to find and delete the "umm" sounds and long silences from their recording.

11 Audio File Formats

Audio can be saved in different formats. The main ones are:

FormatFull FormKey Point
MP3MPEG-1 Audio Layer 3Most common; small file size, slight quality loss
AACAdvanced Audio CodingBetter quality than MP3 at the same size; used by YouTube, iPhone
WAVWaveform Audio File FormatVery high quality, no compression; large file size
Remember: WAV gives the best quality but takes more space, while MP3 saves space and is best for sharing and storing many songs.

12 Video

Video is a series of still pictures (called frames) shown one after another very quickly, together with sound, so that they look like continuous movement.

Our eyes cannot notice each separate picture when they change fast enough; instead we see smooth motion. A movie, a recorded class, a TikTok clip and a CCTV recording are all videos.

Key idea: A video is really just many photos played fast. If you slow a video down a lot, you can see the individual frames.

13 Frame Rate

Frame rate is the number of frames (pictures) shown in one second of video. It is measured in fps (frames per second).

The higher the frame rate, the smoother the video looks. Common frame rates are:

  • 24 fps: used in films/movies (the "cinema" look).
  • 30 fps: used in TV and most YouTube videos.
  • 60 fps: very smooth; used in games and sports videos.
Example: A game played at 60 fps feels much smoother than one at 30 fps. That is why gamers want a high frame rate.

14 Resolution (SD, HD)

Resolution is the number of pixels in a picture or video, usually written as width × height. More pixels means a sharper, clearer picture.
TypeFull FormTypical ResolutionQuality
SDStandard Definition640 × 480Normal, lower clarity
HDHigh Definition1280 × 720 / 1920 × 1080Sharp and clear
Good to know: On YouTube, 480p is SD, while 720p and 1080p are HD. Even higher is 4K (Ultra HD) with about 3840 × 2160 pixels.

15 Video File Formats

Videos are saved in different formats. The main ones are:

FormatFull Form / OriginKey Point
MP4MPEG-4 Part 14Most popular; small size, good quality, works everywhere
MOVQuickTime Movie (Apple)High quality; common on Apple/Mac devices
AVIAudio Video Interleave (Microsoft)Good quality but large file size; older format
Tip: MP4 is the best choice for sharing online because it keeps good quality while staying small.

16 Animation

Animation is the technique of making drawings, images or models appear to move by showing a series of slightly different pictures quickly, one after another.

Just like a video, animation works because the pictures change fast enough that our eyes see smooth movement. The difference is that animation pictures are created or drawn on a computer, not recorded with a camera. Cartoons like Tom and Jerry and films like Frozen are animation.

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Image: A bouncing ball shown as a series of frames
Place your image here (filename: animation-frames.png)

17 Purpose & Use of Animation

Animation is used for many purposes because it can show things that are hard to film in real life.

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Entertainment

Cartoons, animated movies and game characters.

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Education

Showing how the heart pumps blood or how planets move.

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Advertising

Eye-catching animated ads and moving logos.

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Simulation

Showing how a building or machine will work before it is built.

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Medicine & Science

3D models of the body, molecules and weather systems.

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Websites & Apps

Loading icons, moving buttons and fun effects.

18 2D and 3D Animation

Animation is mainly of two types: 2D and 3D.

2D Animation

2D animation uses flat images that have only height and width (two dimensions). It looks like a moving drawing.

Examples: Tom and Jerry, Doraemon and most simple cartoons.

3D Animation

3D animation uses solid models that have height, width and depth (three dimensions). It looks more real, like a sculpture that moves.

Examples: Frozen, Toy Story and characters in modern video games.

2D Animation3D Animation
Flat: height and width onlySolid: height, width and depth
Looks like a drawingLooks real and lifelike
Easier and cheaper to makeHarder and more costly to make
Adobe Animate, Pencil2DBlender, Maya, 3ds Max
Example: DoraemonExample: Frozen

📝 Exercises & Quiz

Test what you've learned! Click Show Answer to check yourself.

📚 Short Terms / Glossary

Multimedia
Combination of text, graphics, audio, video and animation.
Graphics
Still pictures, drawings and images on a computer.
Pixel
The tiny coloured dot that makes up a raster image.
Raster Graphics
Images made of pixels; blur when zoomed.
Vector Graphics
Images made of maths lines; stay sharp at any size.
Waveform
Visual wavy line that represents a sound.
Frame
One single still picture in a video.
Frame Rate
Number of frames shown per second (fps).
Resolution
Number of pixels in an image or video.
Animation
Making drawings or models appear to move.
2D Animation
Flat animation with height and width only.
3D Animation
Solid animation with height, width and depth.

🔤 Full Forms (Click "Reveal" to check)

JPEG Joint Photographic Experts Group
PNG Portable Network Graphics
GIF Graphics Interchange Format
TIFF Tagged Image File Format
SVG Scalable Vector Graphics
PDF Portable Document Format
MP3 MPEG-1 Audio Layer 3
AAC Advanced Audio Coding
WAV Waveform Audio File Format
MP4 MPEG-4 Part 14
AVI Audio Video Interleave
SD / HD Standard Definition / High Definition
CAD Computer-Aided Design
fps Frames Per Second

✅ Choose the Correct Answer (MCQ)

1. Which of the following is NOT a component of multimedia?
A Text
B Audio
C Keyboard
D Animation
2. Raster graphics are made up of:
A Pixels
B Lines and curves
C Frames
D Waves
3. Which format keeps a transparent background and good quality?
A JPG
B PNG
C WAV
D MP4
4. Which image type stays sharp at any zoom level?
A Raster
B Vector
C Bitmap
D JPEG
5. A waveform shows the loudness and ____ of a sound.
A Colour
B Pitch
C Size
D Weight
6. Which audio format gives the highest quality but largest size?
A MP3
B AAC
C WAV
D GIF
7. Frame rate is measured in:
A Pixels
B Hertz
C fps
D Bytes
8. Which is the most popular video format for sharing online?
A AVI
B MOV
C MP4
D WAV
9. 1920 × 1080 is an example of which resolution?
A SD
B HD
C Low resolution
D None
10. Which software is free 3D animation software?
A Photoshop
B Blender
C Canva
D Audacity

✍ī¸ Short Answer Questions

1 What is multimedia? Write its five components.
Answer: Multimedia is the combination of different forms of content presented together through a computer. Its five components are text, graphics, audio, video and animation.
2 Write any four applications of multimedia.
Answer: Multimedia is used in education, entertainment, business, healthcare, science and research, communication, and training and simulation (any four).
3 Differentiate between raster and vector graphics.
Answer: Raster graphics are made of pixels and become blurry when zoomed; they are best for photos (JPEG, PNG). Vector graphics are made of mathematical lines and stay sharp at any size; they are best for logos and icons (SVG, AI).
4 What is an audio waveform? Why is it needed?
Answer: An audio waveform is a visual wavy line that represents a sound, showing its loudness and pitch over time. It is needed because it lets us see the sound and makes editing (cutting, joining, removing noise and silence) easy.
5 Define frame rate and resolution.
Answer: Frame rate is the number of frames (pictures) shown in one second of video, measured in fps. Resolution is the number of pixels in an image or video (width × height); more pixels means a clearer picture.
6 Differentiate between 2D and 3D animation.
Answer: 2D animation uses flat images with only height and width and looks like a drawing (e.g. Doraemon). 3D animation uses solid models with height, width and depth and looks more real (e.g. Frozen).
7 Difference between video and animation.
Answer: Video is made of real pictures recorded from the world by a camera. Animation is made of pictures or models created/drawn on a computer and made to look like they are moving.
8 Write any two 2D and two 3D animation software.
Answer: 2D software: Adobe Animate, Pencil2D, Toon Boom Harmony, Synfig (any two). 3D software: Blender, Autodesk Maya, 3ds Max, Cinema 4D (any two).

🛠ī¸ Practical Ideas (Try in the lab)

  1. Make a poster in Canva using text, an image and a logo: a real multimedia product.
  2. Open a photo and zoom in fully to see the pixels (raster), then open an SVG icon and zoom in to see it stays sharp (vector).
  3. Save one image as JPG, PNG and GIF and compare their file sizes and quality.
  4. Record your voice in Audacity, look at the waveform, and cut out the silent parts.
  5. Play a YouTube video and change the quality from 480p (SD) to 1080p (HD) to see the difference.
  6. Make a short animation of a bouncing ball using Pencil2D or PowerPoint.