Operating systems are usually pre-installed on computers. Most people use the OS that comes with their device. However, you can upgrade or switch to a different one.

The most common OS for personal computers are:

• Microsoft Windows
• macOS
• Linux

Modern operating systems use a graphical user interface (GUI). A GUI allows you to click icons, buttons, and menus using a mouse. It displays information with graphics and text, making it easier to use.

Each OS has a unique look and feel. Switching to a new OS might feel strange at first. However, they all follow similar principles.