<p>The recorder is the brain of a CCTV system: it receives the video, stores it and lets you play it back. The three common types differ in the cameras they work with.</p> <h2>DVR (Digital Video Recorder)</h2> <p>A DVR works with analog and HD-analog cameras connected by coaxial cable and BNC connectors. It is a common, cost-effective choice when you are upgrading an existing analog system.</p> <h2>NVR (Network Video Recorder)</h2> <p>An NVR works with IP cameras over a network. Many NVRs have built-in PoE ports, so each camera needs only one CAT6 cable for power and video. It is the usual choice for new installations.</p> <h2>XVR (Hybrid Recorder)</h2> <p>An XVR accepts analog, HD-analog and IP cameras on the same unit. It is useful when you want to keep some old cameras and add newer ones step by step.</p> <h2>How to choose</h2> <ul><li>Existing coaxial cabling: DVR or XVR.</li><li>New build with network cabling: NVR.</li><li>Mixed old and new cameras: XVR.</li></ul> <p>Whatever you choose, match the recorder to the number of camera channels you need, leave a few spare channels for the future, and fit a surveillance-grade hard disk.</p>