This document provides an overview of computers and how they work. It explains that a computer needs instructions to perform tasks as it does not have its own thinking capacity. The basic working principle of a computer is that it takes in data and instructions as input, processes the input, and provides output. Computers are characterized as having high speed, accuracy, diligence, versatility, high storage capacity, and communication abilities. It works through input, processing, and output and can perform many tasks quickly and accurately without tiring.