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Operating system

Application software

Peripheral devices

An operating system (OS) is a collection of software that manages computer hardware resources and provides common services for computer programs.
Windows

Word
Microsoft Word is a popular word-processing program used for creating documents such as letters, brochures, learning activities, tests, quizzes and students' homework assignments.
Excel
Microsoft Excel is a commercial spreadsheet application written and distributed by Microsoft for Microsoft Windows and Mac.

Peripheral devices are hardware items that are connected externally to a computer and are used in data transfer for example
Input
Keyboard. Mouse. Joystick. Scanner.
Output
Monitor. Printers. Plotters. Speakers.

A modem

A modem is a device that allows a computer to communicate over a network

CPU
CPU is the abbreviation for central processing unit. The CPU is the brains of the computer where most calculations take place.

Main memory

The main memory of the computer is also known as RAM, standing for Random Access Memory. It is constructed from integrated circuits and needs to have electrical power in order
Hard disk