When in the context of digital devices, such as PCs, a bus refers to a set of conductors (hard wired) on the circuit board of the device (motherboard).

The bus is split into two 'channels', one that transfers the data and one that specifies where the data should be transferred to. The Internal Bus connects all of the PC's components to the CPU and memory banks.

The bus width refers to the amount of bits that can be transferred at any one time, for example, a 32-bit bus can transfer 32 bits of data simultaneously.

The bus speed (frequency) is usually measured in MHz, for example, say a bus has a speed of 100Mhz and a width of 32 bits, then the bus can transfer 3,200,000,000 bits of data per second!

When in the context of networking, a bus refers to the cable (backbone) that connects all of the devices together.

An FSB (FrontSide Bus) transfers data between the CPU, the memory bank and other components.

A BSB (BackSide Bus) transfers data between the CPU and the L2 Cache.

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