What's inside a computer?

by Grace Poulter


CPU (Central Processing Unit) is the part of the computer system that is sometimes called the brains of the computer. It is responsible for executing a program. this program will take inputs from an input device, process the input and output the device to an output device.


The computer memory is split up into two parts 'Read Only Memory' (ROM) and 'Randomly Access Memory' (RAM).

ROM is memory that cannot be changed by a program. ROM retains its memory even after the computer is turned off.

RAM is a fast temporary type of memory in which programs, applications and data are stored.

mother board

The motherboard is a printed circuit board that is the foundation of a computer, located at the bottom of the computer case.

CD Drive

this is a data storage for text video and audio. its a cd player.

hard drive

Hard disks spin at very high speeds within a sealed unit inside the computer. Hard disks store large amounts of data - 200GB to 1TB is common in desktop computers. The data stored on a hard disk is retained until deleted, but it needs to be loaded into main store RAM before it can be used.