Stands for "Digital Video Recorder." A DVR is basically a VCR that uses a hard drive instead of video tapes. It can be used to record, save, and play back television programs. Unlike a VCR, however, a DVR can also pause live TV by recording the current show in real time.

Security forms an imperative criterion for all human beings and all human beings deserve to feel secure, far off from all the threats. This also explains the very basic reason of building commercial and residential buildings. The idea behind their construction was to gain a sense of security against all possible threats of weather. However, then there arose the need of protecting the integrated household and expensive business commodities. Security guard was therefore employed for the same reason.