GIGABYTES, MEGABYTES, BYTES AND BITS
Bits = the zeroes and ones that make up data and commands in the computer world. The millions of transistors in computer chips can only be in two states: on or off (one or zero). So every number, bit of data and command has to be translated into the binary numbering system.
Byte = a group of 8 bits, which is like a "word" in the computer world.
Megabyte = 1 million bytes.
Gigabyte = 1 billion bytes.