The acronym for closed-circuit television is CCTV. CCTV is a closed-loop system, unlike traditional television, thus, all content is broadcast within. Nothing captured on CCTV is transmitted over public radio channels.

Security concerns are CCTV's primary use case. CCTV is used for security at a lot of establishments, including bars, residences, schools, restaurants, banks, and country clubs. The security system will stop illegal conduct before it starts, even though it might not be able to stop the bad man.