DVR’s are used not only to record data, but allow you to view multiple cameras remotely. The information is recorded onto a hard drive and can be copied to either a DVD or a flash drive depending on the model you choose. There are a lot of choices when selecting a DVR. Some of the differences are how many cameras they can accept, how large the hard drive is and the software and user interface. Most DVR’s can be added to your home or business network so you can remotely view your CCTV system, and a majority of the manufactures have applications for your smart phone.