Closed-circuit television (CCTV), also known as video surveillance, is the use of video cameras to transmit a signal to a specific place, on a limited set of monitors. It differs from broadcast television in that the signal is not openly transmitted, though it may employ point to point (P2P), point to multipoint, or mesh wireless links. Effective video surveillance based on particularly clear image data. Depending on the area of application, location and individual security needs, the range of required camera functions varies for the type of security needed. In the following, we present you with different technologies – IP, HD-SDI, AHD (HD-TVI) and analog – to give you an initial overview of the strengths of the individual camera types.