Computer is a machine that can be instructed to carry out sequences of arithmetic or logical operations automatically via computer programming. Modern computers have the ability to follow generalized sets of operations, called programs.
These programs enable computers to perform an extremely wide range of tasks.
A “complete” computer including the hardware, the operating system (main software), and peripheral equipment required and used for “full” operation can be referred to as a computer system. This term may as well be used for a group of computers that are connected and work together, in particular a computer network or computer cluster.
Early computers were only conceived as calculating devices. Since ancient times, simple manual devices like the abacus aided people in doing calculations.
The first digital electronic calculating machines were developed during World War II. Following the development of transistors and integrated circuits, the speed, power and versatility of computers have been increasing dramatically ever since then.
Conventionally, a modern computer consists of at least one processing element, typically a central processing unit (CPU), and some form of memory.
The processing element carries out arithmetic and logical operations, and a sequencing and control unit can change the order of operations in response to stored information.
PERIPHERAL DEVICES include
- joystick, etc.
- monitor screens
- printers, etc.),and input/output devices that perform both functions (e.g., the 2000s-era touchscreen).
Pheripheral devices allow information to be retrieved from an external source and they enable the result of operations to be saved and retrieved.