A computer is a machine that accepts data as input, processes it, and produces useful information as output. It can perform tasks like calculations at high speeds without errors. While computers are powerful tools, they require human programming and instructions to function. Computers have expanded capabilities like processing text and graphics. They are automated, have memory to store information for long periods, and can perform repetitive tasks accurately. Computers have become indispensable in modern society for tasks like accessing information online, entertainment, communication, and more.