Welcome ! Our Honourable Guest :)
A computer generally means a programmable machine. The two principal characteristics of a computer are: it responds to a specific set of instructions in a well-defined manner and it can execute a prerecorded list of instructions (a program).
Modern Computers DefinedModern computers are electronic and digital. The actual machinery — wires, transistors, and circuits -- is called hardware; the instructions and data are called software..
All general-purpose computers require the following hardware components:
Computer Classification: By Size and PowerComputers can be generally classified by size and power as follows, though there is considerable overlap:
Personal : a small, single-user computer based on a microprocessor. In addition to the microprocessor, a personal computer has a keyboard for entering data, a monitor for displaying information, and a storage device for saving data.