Bits and Bytes
All the information in a computer is stored as a series of binary numbers (ones and zeros).
One digit (a one or a zero) is called a bit:
0 1 0 0 1 0
Four bits are called a nibble, though nobody uses this term anymore:
0100 1101 1010 1111
We call a group of eight bits a byte:
01011101 11101011 01010101