Computer Basic      Hardwware         Sofware

What is Computer?

Computer is an electronic device that is designed to work with Information. The term computer is derived from the Latin term ‘computare’, this means tocalculate or programmable machine. Computer can not do anything without a Program. It represents the decimal numbers through a string of binary digits. The Word 'Computer' usually refers to the Center Processor Unit plus Internal memory

Digital Computer Definition

Input

Whatever goes into the computer. Input can take a variety of forms, from commands you enter by keyboard to data from another computer (via a network connection) or device (via direct or network connection). A device that feeds data into a computer, such as a keyboard or mouse, is called an input device.

Output

Any information (data) that comes out of a computer. Output devices can be other computers, display screens, speakers, and printers.

Storage

Computer data storage is referred to as storage or memory, which can save digital data. Examples are RAM, hard disks, CDs, DVDs and removable flash memory sticks.

Permanent, or non-volatile, storage devices do not require power to remember the data stored. The mass storage devices shown above are non-volatile; a loss of power does not affect their ability to retain data. This category also include ROM (Read Only Memory).

Temporary or volatile storage is more often called "memory". A loss of power means that any data stored will be lost irretrievably. When you are using an application, such as a word processor, the data (the document you are working on) is stored in RAM (Random Access Memory). If you lose power without explicitly saving your work, you will likely lose data.

Processing

The processor is the brain of a computer. It's also called the CPU (Central processing unit) and it is a microchip. For a non-programmer, this is where all the real action is. Programs just set the stage and directs the play. (In this off hand analogy, the play itself, in written form, would be most like a program.)