All the data movements within a computer occur through buses. A bus is a group of electrical conductors, mostly wires, running parallel to each other carrying a charge form one point to another within the computer. A bus can be copper traces on a circuit board or wires in a cable. Usually, a bus is found in multiples of eight (8, 16, 32, 64, and so on). In the early computer, manufacturers used a set of eight wires for constructing was required.