A computer is a machine or device that performs processes, calculations and operations based on instructions provided by a software or hardware program. It has the ability to accept data (input), process it, and then produce outputs.
Computers can also store data for later uses in appropriate storage devices, and retrieve whenever it is necessary.
Modern computers are electronic devices used for a variety of purposes ranging from browsing the web, writing documents, editing videos, creating applications, playing video games, etc.
Computer is not an acronym, it is a word derived from a word “compute” which means to calculate. So, in simple words you can say that computer is an electronic device which is used for fast calculation.
Some people say that COMPUTER stands for Common Operating Machine Purposely Used for Technological and Educational Research. It is only a myth because first this definition does not make any sense and second when the computer were invented they were just calculating machines which needs a lot of space for establishment.
Categorization on the basis of generation
- First generation computers: (1940-1956) based on Vacuum tubes.
- Second generation computers: (1956-1963) based on Transistors
- Third generation computers: (1964-1971) based on Integrated Circuits
- Forth generation computers: (1971- Present) Based on Microprocessors
- Fifth generation computers: (Present and Beyond) based on Artificial Intelligence
There are many types of computers available on the basis of their working areas: Super computer, work frames, personal computer, desktops, laptops, palmtops etc.
COMPUTER = Arithmetical Logical Unit (ALU) + Control
ALU: Arithmetic Logical Unit is used to carry out arithmetic and logical operation. Some of this computers has LTE/4G Network
CU: Control unit is used to change the order of operations in response to stored information.