Ans. COMPUTER
A computer is an electronic computing machine that is used for adding, subtracting and multiplying.
Computer plays an important rote in our daily We. fn offices, computes, art used for preparing letters, documents and reports. In hotels, computers are us*d,&r advance booking of rooms, preparing bills and providing enquiry services 4n railways, computers are uted for rail reservation, printing of tickets and preparation of reservation charts! Doctors use computers for diagnosing illness and treatment of diseases Architects use computers for building designing and city planning. In meteorology department, computers are used for weather forecasting. In short, we can say that computer has become the basic need of today.