What is a CCTV camera?

A CCTV camera (Closed-Circuit Television) or analog camera works in a closed circuit

The CCTV camera can be directly connected to a monitor. In that case it is only possible to visualize real time streaming videos localy

If videos recording is needed, the CCTV camera must be linked to a DVR (Digital Video Recorder) 

In both cases the cable used to connect the CCTV camera is a coaxial cable like those used for TV

If the real time streaming videos must be remotly accessible (via Internet), the camera has to be linked to a digital recorder (featured with an Ethernet port) or to a video encoder 

Limitations and disadvantages