BNC connector

A BNC connector is a little plug that gets put on the ends of wires to help them connect to electronic devices. It looks kind of like a twisty shape and has a little metal pin inside that sticks out. To use it, you twist the connector onto the end of the wire until it clicks and the metal pin makes contact with the device you're connecting it to. It's sort of like a key that helps unlock a door, but for wires and electronics.