A computer is an electronic device that takes data (input), processes it according to given instructions (programs), and produces information (output).

🔹 Basic Definition:

A computer is a machine that can store, retrieve, and process data to perform various tasks like calculations, writing documents, playing games, or browsing the internet.

🔹 Main Functions of a Computer:

1. Input: Taking data from input devices (keyboard, mouse, scanner, etc.)

2. Processing: Performing operations on the data (done by the CPU)

3. Output: Displaying or sending results (on monitor, printer, etc.)

4. Storage: Saving data and information for future use

🔹 Main Components:

1. Hardware: The physical parts (CPU, monitor, keyboard, mouse, etc.)

2. Software: The set of programs and instructions that tell the computer what to do (Windows, MS Word, etc.)

🔹 Types of Computers:

• Supercomputer: Very fast and powerful (used in research, weather forecasting)

• Mainframe computer: Used by large organizations for bulk data processing

• Personal computer (PC): Used by individuals for general tasks

• Laptop / Tablet: Portable computers

• Microcontroller: Small computers used in devices like washing machines or cars

🔹 Simple Example:

When you type a message on your phone:

• You input letters using the keyboard.

• The processor converts them into digital form.

• The output is shown on the screen.

• The data can be saved in memory.