A bus is a set collection of wires that allow information and signals to travel between components inside or outside of a computer.
Types of bus systems for the motherboard:
ISA Bus: The original 8-bit bus used in first-generation IBM PCs accepted only 8-bit expansion boards. It was superseded by the 16-bit AT bus, later known as the ISA bus.
VL-Bus (VESA Local bus): was a bus originally used with the 486 computers and was limited in the number of slots to add on devices. Used for expansion cards such as video cards.
PCI Bus: This bus is the present standard. It can transfer data 64-bit at a time with rates up to 66 MHz. The fastest of the present PIC is the PCI express (clock speeds reaching 133 MHz).
