Computer interface Technology .
Serial interface Read about PC interfaces here .
If you send bits one at a time, you are using serial communication. If you send one extra bit for each 8 bits to make sure your data got there intact, it is called a parity bit. Bit parity can be odd or even. It is even, if you assign 0 to the parity bit when the sum of the 8 bits is a even number. In this case, you assign 1 to the parity bit when the sum is an odd number.