A computer is a device that accepts information (in the form of digitalized data) and manipulates it for some result based on a program, software, or sequence of instructions on how the data is to be processed.
Complex computers include the means for storing data (including the program, which is also a form of data) for some necessary duration. A program may be invariable and built into the computer hardware (and called logic circuitry as it is on microprocessors) or different programs may be provided to the computer (loaded into its storage and then started by an administrator or user). Today’s computers have both kinds of programming.
Major types of computers
Analog computer – represents data by measurable quantities
Desktop computer – a personal computer that fits on a desk and is often used for business or gaming
Digital computer – operates with numbers expressed as digits
Hybrid computer –