Have you ever wondered why a computer can only understand binary code ... numbers and letters using only two digits: 0 and 1. Each digit in binary code is called a bit, and eight bits make up a byte.

A binary digit, or bit ... processed by a computer is stored in bits. Any data or instructions sent to the CPU must first be changed into binary code, also known as machine code.

Note that binary numbers are usually written in blocks of four, separated by a space (eg 0111 1011). In denary, numbers are often written in blocks of three (eg 6 428 721). A quick way to check ...