Many people mistakenly refer to disk space as memory. All the information in a computer's memory is in binary. In binary, Mary's age of four is 0000000000000100, but if Mary were 8000 years old her age would be 0001111101000000. A byte is the smallest unit of memory measure. It is made up of eight bits.
Information always comes in a size measured in bytes.
For example, a single character is one byte, and an integer can be two bytes. If your name is Mary for example, your name would take up four bytes since it is four letters long. On the other hand, an integer would only take up two bytes in memory. Whether Mary's age is 8 or 8000, it would only occupy two bytes. The following are definitions of terms used frequently to describe memory.