The flat-surfaced piece of furniture at which you sit and work, write, or use your computer is called a desk. Some offices have a desk for each employee.
Students often sit at classroom desks arranged in rows, and you'll also find desks in libraries, offices, and homes. Your college roommate might prefer to study while lying in bed, while you like working at your desk. Someone who has a "desk job" works in an office. Desk comes from the Medieval Latin desca, "table to write on," which has a Greek root, diskos, "platter or disk."