Computer - Short definition:

A computer is an electronic machine that takes input, processes data, and gives output as information.

Computer - Detailed Explanation:

A computer is an electronic machine that accepts data as input, processes it according to given instructions, store it, and produces output as useful information. It works very fast and accurately.

A computer mainly performs four basic functions:

1. Input: It receives data and instructions through input devices like keyboard and mouse.

2. Processing: The CPU (Central Processing Unit) processes the data.

3. Storage: It stores data and information in memory (RAM, hard disk, etc.).

4. Output: It gives results through output devices like monitor and printer.

A computer is widely used in schools, offices, hospitals, banks, and homes for different tasks such as typing documents, calculations, internet browsing, and storing information.

Therefore, a computer is an important electronic device that makes our work easier, faster, and more accurate.