Electrical bus

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An electrical bus (sometimes spelled buss) is a physical electrical interface where many devices share the same electric connection. This allows signals to be transferred between devices (allowing information or power to be shared). A bus often takes the form of an array of wires that terminate at a connector which allows a device to be plugged onto the bus.

Buses are used for connecting components of a computer: a common example is the PCI bus in PCss. See computer bus.
Buses are used for communicating between computers (often microprocessors). See computer bus.
Buses are used for distribution of electrical power to components of a system. The (usually) thick connectors used are called bus-bars. In an electrical laboratory, for example, a bare bus-bar will sometimes line the wall, to be used by the engineers and technicians for its high electrical current carrying capacity, which allows a convenient approximation to zero voltage, or ground in the US, and earth in the UK.