The CPU is connected to memory and I/O through strips of wire called a bus
• The bus inside a computer carries information from place to place just as a street bus carries people from place to place.
• In every computer there are three types of buses: address bus, data bus, and control bus.
• Address bus is used to transport the address for identifying the devices and memory connected to the CPU.
• Data bus is used to carry the data in and out of a CPU.
• Control bus is used to indicate the CPU need to READ data from or WRITE data to the memory or the I/O devices.