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Contents
1) What is a computer?
2) Components of computer
 
1) What is a computer?
A general purpose machine that processes data according to a set of instructions that are stored internally, either temporarily or pernamently. Computer and all equipment attached to it are called hardware. The instructions tell what to do are software.
 
2) Components of computer
All general-purpose computers require the following hardware components: memory : Enables a computer to store, at least temporarily, data and programs. mass storage device : Allows a computer to permanently retain large amounts of data. Common mass storage devices include disk drives and tape drives. input device : Usually a keyboard and mouse, the input device is the conduit through which data and instructions enter a computer. output device : A display screen, printer, or other device that lets you see what the computer has accomplished. central processing unit (CPU): The heart of the computer, this is the component that actually executes instructions.
 

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