meaning to calculate. Today, the word computer refers to computing devices that can store, retrieve and process data. The term ‘computer’ is derived from Latin word “computer” meaning to calculate. In the past computer is restricted only to arithmetic calculation. In the past time the weight of the computer is very heavy and also has large surface area. It can moved from one place to another place. It is as big as one class room. It also cannot be operated with one or even with few persons.