The BNC connector is used for signal connections such as:

analog and serial digital interface video signals
amateur radio antennas
aviation electronics (avionics)
test equipment.

It is an alternative to the RCA connector when used for composite video on commercial video devices, although many consumer electronics devices with RCA jacks can be used with BNC-only commercial video equipment via a simple adapter. BNC connectors were commonly used on 10base2 thin Ethernet networks, both on cable interconnections and network cards. The TNC (threaded) connector is used for stable performance at higher frequencies than used with the BNC connector.

BNC connections can also be found in recording studios. Digital recording equipment uses the connection for synchronization of various components via the transmission of word clock timing signals.