Coaxial Cable Cutaway (Source: Wikipedia)
The coaxial cable is a type of electrical cable that has an inner conductor surrounded by a tubular insulating layer, surrounded by a tubular conducting shield. Many coaxial cables also have an insulating outer sheath or jacket. The term coaxial comes from the inner conductor and the outer shield sharing a geometric axis.
There are many kinds of coaxial cables to suit different applications, among them all, RG6 and RG59 are the most commonly use coaxial cable for video signal transmission. Also, coaxial cables can patch with many different connectors for different purpose as well.
Here's the different type of connectors a coaxial cable can have:
F-type connector (Source: Wikipedia)
The F connector is a coaxial RF connector (radio frequency connector) commonly used for "over the air" terrestrial television, cable television, universally for satellite television and cable modems, with you can still find it at the back of your television today for Antenna and satellite TV connection.
The RCA connector is a type of electrical connector commonly used to carry audio and video signals, you can still find this type of connector on most of the audio/video devices this day.
BNC connector (Source: Wikipedia)
The BNC (Bayonet Neill–Concelman) connector is a miniature quick connect/disconnect radio frequency connector used for coaxial cable. BNC connectors are mostly use on CCTV (Closed-circuit television) systems such as surveillance cameras this day.