An operating system is the main
software that controls how a computer works. It helps the computer's hardware and other
software work together. Without an OS, the computer can't run programs.
Examples of Operating Systems:
Windows (like Windows 10, Windows 11)
macOS (used in Apple computers)
Linux (like Ubuntu)
Android (used in phones)
iOS (used in iPhones)
Types of Operating Systems:
Single-user OS – for one person at a time (e.g., Windows 10)
Multi-user OS – allows many users at the same time (e.g., Linux server)
Mobile OS – used in smartphones (e.g., Android, iOS)
Real-time OS – used in machines and robots where fast response is needed
File Types and Extensions:
The OS helps organize and manage files. Files come in different types, and each has a file extension (letters after the dot in a file name).
Text files – .txt, .docx
Image files – .jpg, .png
Audio files – .mp3, .wav
Video files – .mp4, .avi
Program files – .exe, .apk