The Digital Video Recorder
A digital video recorder records video and stores it as digital data. It can either be a piece of hardware or a computer software. The video recorded can be from a variety of sources, such as a DVD, analog television, cable television cables, video cameras or other sources. In some ways, a digital video recorder can be thought of as performing the same function as a VCR. However, the recorded video is stored in a digital format ,such as AVI or MPEG, much like the data on a DVD. Recorded content can be indexed, searched and manipulated in other ways that a video cassette cannot. DVRs have become for security and surveillance systems.