A BNC connector allows you to connect your security camera to your DVR unit. BNC connectors typically is just a term to express the industry standard for digital/analog signal connection. All security cameras, DVRs, multiplexers, have these ends. The connectors below all fit these connections. The major connections are twist-on-BNC-connectors, crimp-on-BNC-connectors, and compression-BNC-connectors. The rest of the pieces are adapters and they help end-users achieve the right connection, which enables them to render live video feeds from their security cameras.