This category includes board to board connectors designed for connecting two printed circuit boards (PCBs). It includes DIN rail compatible cards, universal interface boards, wire-to-board connectors, IDC plugs, and connector accessories like dust covers. Excludes photovoltaic connectors, circular and rectangular connectors, card edge connectors, terminal blocks, crimp and solder terminals, backplane connectors, flexible flat cable (FFC) and flexible printed circuit (FPC) connectors, D-sub connectors, coaxial RF connectors, and other non-board-to-board connection types.