This category includes card edge connectors, which are used to connect circuit boards directly to a motherboard or backplane. It does not include photovoltaic connectors, circular connectors, rectangular connectors, terminal blocks, board-to-board connectors, crimp and solder terminals/splices, backplane connectors, flexible flat cable (FFC) and flexible printed circuit (FPC) connectors, D-sub connectors, or coaxial RF connectors.