The operating system is the main manager of the computer. It controls hardware, runs applications, organizes files, and provides security and accessibility settings.
The operating system's job
When a computer starts, the operating system loads and provides the sign-in screen, desktop, file manager, settings, and application environment. It also manages memory, storage, network connections, printers, updates, and user accounts.
Common desktop systems
Windows is widely used in homes, schools, and businesses and supports a broad range of hardware and software. macOS runs on Apple Mac computers and is closely integrated with other Apple devices. ChromeOS is centred on the Chrome browser and web-based applications. Linux is available in many distributions and offers extensive choice, though support and setup vary.
Compatibility matters
An application written for one operating system may not run on another. Before changing systems or buying a peripheral, check that required programs, printers, scanners, and specialized files are supported.
Web applications reduce some differences because they run in a browser, but offline access and feature sets can vary.
Updates and support
Security and feature updates correct problems and add compatibility. Keep supported systems current, restart when required, and avoid depending on an operating system that no longer receives security fixes.
Back up important files before a major upgrade, and confirm that critical applications will continue to work.
Quick skill check
- Identify the current operating system and version
- Find the Settings area
- Check for updates
- Confirm app and printer compatibility before changing systems
- Back up before a major upgrade