DVR (Digital Video Recorder) and NVR (Network Video Recorder) are electronic devices that record video in a digital format to a disk drive, USB flash drive, SD memory card or other local or network mass storage device. DVRs typically encode and store analog video signals from sources like security cameras or cable TV, while NVRs record video streamed over a network from IP cameras. They are commonly used in security systems for surveillance, allowing users to record and review footage.
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