Backplane refers to a board that offers a connection to multiple subsystems. This term is significant in electronic and computer engineering, but it can be substituted by other synonyms such as motherboard or a back-panel. A motherboard is a circuit board that is essential for a computer to function. It connects and transmits data between a CPU, memory, and other components. On the other hand, a back-panel includes connectors for cables and is mounted on the backside of a chassis, providing wiring connections to other devices. Other possible synonyms include Eurocard, backsheet, and I/O panel. These terms have slightly different meanings but refer to similar functionalities.