カードエッジコネクタ

Card edge or edgeboard connectors are a style of connector system in which (typically) a pattern of exposed copper regions at the periphery of a printed circuit board constitutes one-half of a mating connector pair. A common use case being the connection of accessory cards such as graphics accelerators to computer motherboards in desktop PC applications, they offer a relatively low-cost, high density interconnect option for applications where durability is not a primary concern.