The BNC connector, named after its bayonet-style connector and its two inventors (Neill and Concelman) is a little bigger than the other connectors we've mentioned here. Also, because the BNC connector uses a slotted conductor, it can become an accidental radiator at at frequencies above 4GHz so its usually used for radio applications below 3GHz. You may have seen BNC connectors used for composite video on things like older studio equipment or CCTV cameras. They were also used on 10base2 this Ethernet networks. Today, they're used largely on amateur radio equipment and test equipment. You'll see these on things like oscilloscopes and different kinds of sensor connections.