A DVR or NVR security system is a choice you have to make before setting up a video surveillance system. It matters a lot since it decides the cost, the installation, the best video quality you could expect.

CCTV (closed-circuit television) is a TV system in which signals are not publicly distributed but are monitored, primarily for surveillance and security purposes

There are many cables used for the CCTV depending your camera whether it is analog or IP