VMEbus is a computer bus standard physically based on Eurocard sizes.
VME64 crate with, from left, an ADC module, a scaler module and a processor module
VERSAbus memory card
In computer architecture, a bus is a communication system that transfers data between components inside a computer, or between computers. This expression covers all related hardware components and software, including communication protocols.
Four PCI Express bus card slots (from top to second from bottom: ×4, ×16, ×1 and ×16), compared to a 32-bit conventional PCI bus card slot (very bottom)