If you have any type of security camera, a digital video recorder can be a great piece of equipment because it can store footage that your security cameras shoot. This can be useful in case you need to watch something that you previously recorded. There is an incredibly large variety of digital video recorders, or DVRs, available with different capabilities and features. Most digital video recorders are used with regular cameras that use cords, but you can also use digital video recorders if you have wireless security cameras set up.