In the simplest of terms, CCTV is a form of video surveillance that uses cameras to transmit video to a connected screen (or screens) where recorded activity can be monitored. CCTV is commonly used in places that require ongoing surveillance, like banks, convenience stores, casinos, airports, hotels, and even residential homes. Some CCTV systems provide live video streams that can be actively monitored by hired staff, while others record video for later review. The most common application of CCTV surveillance is to deter theft and help identify perpetrators of crime.