DVR and NVR systems that allow autonomous recording of multiple cameras on a hard drive. Allow the recording of images from multiple video cameras and subsequent access to the images if necessary. The ultimate solution for a system of closed circuit television (CCTV) for video surveillance. DVR stands for Digital Video Recorder, which allows the use of video cameras CVBS. NVR is the acronymNetwork Video Recorder, which permits the use of cameras TCP/IP video via Ethernet.