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The main components are:

The Central Processing Unit (CPU), which does the actual computing (calculating). Information is processed there.

The Internal (RAM) Memory, in which programs that are running and documents that are being used are stored.

The Hard Drive, where programs and documents are stored permanently, for a longer time.

The Motherboard, who create internally links between all physical components of the computer. It regulates the flow of information inside the computer.

Optionally, a Floppy, CD or DVD drive.

An assortment of cards (all optional):

The graphics card, which creates the image you see on screen.

The sound card, which creates the sound you hear.

The network card, with which you connect to the internet.

There are also the devices outside of the computer:

Keyboard

Mouse

Monitor

Speakers

Printer

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