Binary prefix

A binary prefix is a number that tells us how big a computer file is. They are like a shorthand way of talking about how big something is on a computer. For example, a kilobyte (KB) is 1,000 bytes and a megabyte (MB) is 1,000,000 bytes. So if you see a file that is 8 KB it means it is 8,000 bytes. And if you see a file that is 8 MB it means it is 8,000,000 bytes.