DVR and NVR are two types of digital video recorders used for video surveillance purposes.
DVR stands for Digital Video Recorder, which is a device that records video from analog surveillance cameras. A DVR converts the analog video signal into a digital format and stores it on a hard drive for later playback. DVRs typically use coaxial cables to connect to the cameras, and they are commonly used in older surveillance systems.
NVR stands for Network Video Recorder, which is a device that records video from digital surveillance cameras. NVRs receive video data from IP cameras over an Ethernet network and store it on a hard drive for later playback. NVRs can also support additional features such as advanced analytics and remote access via a network connection. They are commonly used in modern surveillance systems that utilize IP cameras.
The key difference between DVRs and NVRs is that DVRs are designed to work with analog cameras, while NVRs are designed to work with digital IP cameras. While both DVRs and NVRs perform the same basic function of recording and storing video footage, NVRs offer greater flexibility and more advanced features due to their ability to work with digital cameras over an IP network.