We install CCTVs in homes and offices. CCTV is a video system in which specifically placed cameras record video images and transmit these to a monitor/monitors, with only a small number of people being able to access it.

Surveillance cameras are video cameras used for the purpose of observing an area. They are often connected to a recording device or IP network, and may be watched by a security guard or law enforcement officer. ... As of 2016, there are about 350 million surveillance cameras worldwide.