DVR stands for digital video recorder. A DVR converts an analog signal into a digital format so that it can be stored on a hard drive or other digital storage device. NVR stands for network video recorder. An NVR records video in a digital format and transmits it over a network. The main difference between DVR and NVR is the way they record video. DVRs record video in an analog format, while NVRs record it in a digital format. Another difference is that DVRs are typically used to record video from CCTV cameras, while NVRs are used to record video from IP cameras. To know more, read this article about difference between DVR and NVR.