Operating System

            An Operating System is software that acts as an interface between the computer hardware and the user.

Example - Windows, iOS, Linux,Ubuntu.

Software - Set of instructions. Two types
1. System Software - Eg. - OS, Compiler, Loader, Linker
2. Application Software - Eg. - MS Office, Mozilla Firefox, games, etc.

Computer hardware - Group of electronic devices like CPU, Keyboard, Mouse, etc.

User - One who is using the system.