Definition:- It is an electronic devices. Which act according to data or instruction.

An electronic device that can automatically accept and store input data process them, and produce output results by interpreting and executing programmed instruction.

Characteristics of computer

Automatic:- Computer is an automatic machine work by itself human intervention, because once started on a job.

Speed:- Computer are very fast devices. It can preform in a few seconds. The work that a human being can do in an entire year. The speed of computer, we not talk in terms of seconds or picoseconds. A powerful computer is capable performing several billion simple arithmetic operation per seconds.

Accuracy:- Addition to being very fast computer are accurate. Accuracy of computer is high and degree of its accuracy depends upon its design. A computer perform every calculation with same accuracy.

Diligence:- Unlike human being. Computer are free from monotony, tiredness and lack of concentration. It can continuously work for hours without creating any error and without grumbling.

versatility:- It one pf the most wonderful things about a computer, we can computer to perform completely different types of work at the same time.

Storage:- Today computer store large volumes of data. A piece of information once recorded or stored in the computer can never by forgetting and can be retrieved almost instantaneously.

No.I.Q:- Computer are not a magical device. Its I.Q is zero at last until today.

No Feeling:- computer does not have emotion, knowledge, experience and feeling because they are machine.