Computer memory sizes are measured in kilobytes (KB), megabytes (MB), gigabytes (GB), terabytes (TB), and so on. A kilobyte is a unit of measurement that represents 1,024 bytes of data. One byte is the amount of storage space required to store a single character of data, such as a letter or a number. So, for example, 1 KB is equal to 1,024 bytes, 1 MB is equal to 1,024 KB, and so on. These measurements are used to determine the amount of data that can be stored in a computer's memory or on a storage device, such as a hard drive or a flash drive.