A digital video recorder (DVR), sometimes referred to by the merchandising term personal video recorder (PVR), is a consumer electronics device or application software that records video in a digital format to a disk drive, USB flash drive, SD memory card, SSD or other local or networked mass storage device. HD-SDI, HD-TVI, HD-CVI, and Analog HD all use Digital Video Recorders. NVR: stands for Network Video Recorder The major difference when it comes to DVR vs. NVR is the basis on which they operate. NVRs rely on a network, and therefore require less wiring. These systems are compatible with IP cameras that also run off of a network, so you have more flexibility in terms of their placement – as long as the camera is connected to the network and you have an Internet connection, you can view your footage live on a TV or monitor. With DVRs, you can view your video footage without an Internet connection if you’re next to the DVR; meaning if your power goes out and you’ve installed a battery backup system, you won’t lose your video connection. DVRs are compatible with HD and analog cameras that are connected through wiring. NVR systems are much more restrictive. Due to the nature of the system and technology, only IP cameras that operate over a network connection can be paired with an NVR surveillance system. A DVR system is more flexible when it comes to compatibility and can be paired with a number of cameras. Despite this fact, we still recommend you consult with our field engineers to meet your unique needs.