Manage Files Effectively
Cambridge IGCSE ICT
The Big Idea
Different file formats exist for different types of data. Choosing the right format means your files work across devices, stay at the right size, and maintain the quality you need.
Quick Overview
File formats are the file types used to store digital data. They determine what kind of data can be stored, how that data is organized, and which software can open the file. Some formats work everywhere (generic), while others need special software (non-generic).
Generic Formats
Work across devices and software
Non-Generic Formats
Need special software or hardware
Lossy Compression
Smaller file, some data lost
Lossless Compression
Smaller file, no data lost
Core Concepts
What Are File Formats?
A file format is the way data is structured and stored in a file. Think of it like a blueprint that tells the computer:
- What type of data is in this file (text, image, video, audio, etc.)
- How that data is organized (in rows, pixels, frames, etc.)
- Which software can read it (certain apps need certain formats)
Key Point
The file extension (.jpg, .txt, .mp4) is like a label that tells you the format, but the real format is determined by the data structure inside the file.
Generic vs Non-Generic Formats
Generic formats are file types that work across different devices and software programs. You can create, edit, and share them anywhere—Windows, Mac, mobile, Linux.
Non-generic formats require special software or hardware to open. If you don't have the right software, you can't access the file.
Why Generic Formats Matter
Generic formats allow data exchange across different applications, are widely supported so anyone can access them, and can be created and edited on many different devices. This is why businesses and schools use generic formats—they ensure everyone can access the same files.
Compression: Lossy vs Lossless
Most digital files are compressed to reduce their size for storage or sharing. There are two main methods:
Lossy Compression
Removes some data from the file. The quality is reduced slightly, but the file becomes much smaller. Good for images and videos where slight quality loss is acceptable.
Example: JPEG – A photo reduced from 15 MB to 2 MB by removing some color detail you wouldn't notice.
Lossless Compression
Reduces file size without losing any data. The original quality is perfectly preserved. Takes up more space than lossy compression but better for situations where quality is critical.
Example: PNG – An image compressed but keeping every single pixel's exact color.
Quick Way to Remember
Lossy = Lose some data (smaller file, lower quality)
Lossless = Lose no data (larger file, perfect quality)
Image Formats