INTRODUCTION: - A computer is a machine that can be programmed to automatically carry out sequences of arithmetic or logical operations (computation). Modern digital electronic computers can perform generic sets of operations known as programs. These programs enable computers to perform a wide range of FEATURE: - HIGH SPEED ACCURACY STORAGE CAPACITY AUTOMATIC VERSATILITY SECRECY CLASSIFICATION OF COMPUTER: - THERE ARE THREE TYPES OF COMPUTER- BASED ON APPLICATION BASED ON SIZE BASED ON PURPOSE