Binary
With computers, eight binary bits together is called a byte. The size of files is commonly measured in kilobytes or megabytes (sometimes in gigabytes). A kilobyte is 1000 bytes. A megabyte is 1000 kilobytes, a gigabyte is 1000 megabytes and a terabyte is 1000 gigabytes. Sometimes, it is easier to measure bytes in groups of 1024, since 1024 is a power of 2. There are 1024 bytes in a kibibyte, 1024 kibibytes in a mebibyte, and 1024 mebibytes in a gibibyte.