Computers use a special "digital" language to perform these tasks. This system is based on 1s and 0s. The words you read and images you see on this screen, for example, are represented in the computer as a series of 1s and 0s. They are cycled through the computer as digital or binary information.
Actually, there are no 1s and 0s inside the computer. Instead, the 1s and 0s represent the state of a transistor switch, or a circuit. Computer hardware is designed to work with the information after it has been binary-coded.