Edge connector sockets consist of a plastic "box" open on one side, with pins on one or both sides of the longer edges, sprung to push into the middle of the open center.
The opposite side of the socket is often an insulation-piercing connector which is clamped onto a ribbon cable.
IBM PCs used edge connector sockets attached to ribbon cables to connect 5.25" floppy disk drives.
Video game cartridges typically take the form of a PCB with an edge connector: the socket is located within the console itself.
The Nintendo Entertainment System was unusual in that it was designed to use a zero insertion force edge connector:[1] instead of the user forcing the cartridge into the socket directly, the cartridge was first placed in a bay and then mechanically lowered into position.