A computer is an electronic device that manipulates information, or data. It has the ability to store, retrieve, and process data. You can use a computer to type documents, send email, and browse the Web.
A computer is a device that accepts information and manipulates it for some result based on a program or sequence of instructions on how the data is to be processed. Complex computers also include the means for storing data for some necessary duration.
Modern computers are electronic and digital. The actual machinery — wires, transistors, and circuits — is called hardware; the instructions and data are called software. Require the following hardware components: memory, mass storage device, input device, output device, central processing unit (CPU.