A DVR, or Digital Video Recorder, is an electronic device that records video in a digital format to a local storage device, most commonly a hard drive
. It can record analog video sources on-site or capture video from a digital source, and can be connected to analog cameras via coaxial cables, enabling them to be accessed remotely
. DVRs offer enhanced functionality like the ability to search recordings for events, or sort by time and date, and can be configured to automatically replace older footage once storage becomes full
. DVRs are limited to the physical number of input channels and are not upgradable, making them best suited for small businesses or home security systems
. Network Video Recording (NVR) is a cloud-based video surveillance recording solution that can be used as an alternative to DVRs
