Information on a digital computer is stored in bits, where each bit is a 0 or a 1, which are stored as different levels of electrical charges. Bits can be combined to represent binary numerical values, which in turn can be combined to represent pictures, sound files, word-processing documents, and can also be used in transmitting information across the internet.
A byte is a unit of data that is 8 bits long. A byte is the standard “chunk size” for binary information in most modern computers
Browse through the following pages:
Stanford University - CS 101 - Kilobytes Megabytes Gigabytes:
https://web.stanford.edu/class/cs101/bits-gigabytes.html
Computer Hope - How much is 1 byte, kilobyte, megabyte, gigabyte, etc.?