The D-subminiature or D-sub is a common type of electrical connector. They are named for their characteristic D-shaped metal shield. When they were introduced, D-subs were among the smallest connectors used on computer systems.
A male DE-9 connector (inline socket)
DA-26 male connector, sometimes incorrectly called DB-26HD or HD-26
Male 13W3 connector (plug)
Comparison of microminiature D connector and male DE-9
Components of an electrical circuit are electrically connected if an electric current can run between them through an electrical conductor. An electrical connector is an electromechanical device used to create an electrical connection between parts of an electrical circuit, or between different electrical circuits, thereby joining them into a larger circuit.
This rear panel of an integrated amplifier features a variety of electrical connectors
Connectors on the back of a 2018 computer
NMEA 2000 cabling using M12 connectors
A 4-pin Mini-DIN S-Video cable, with notches and a rectangular alignment pin