Computer memory measures are often expressed in terms of BYTES. A byte is a unit of digital information that consists of eight bits, and is used to represent a single character, such as a letter, number, or symbol. BYTES are commonly used to measure the size of a file, the amount of memory used by a program, or the capacity of a storage device. BYTES are also used to measure the speed of a computer's processor, as well as the amount of data that can be transferred over a network.