There's no doubt that DVDs have changed the entertainment industry. In fact, many films that were fairly unsuccessful in theaters still manage to make their money back due to the popularity of DVD purchases. In addition, many people like to purchase television shows on DVD. Many old shows are no longer aired, so owning them on DVD is a great way to watch your favorite programs anytime you want.

Some older shows, such as Knight Rider, Dukes of Hazzard, 3rd Rock from the Sun, and Alf, all do quite well in terms of DVD sales. Even newer series that did not perform spectacularly well on television are finding success in the DVD market. One example of this is the show Arrested Development. DVDs are helpful in bringing critically acclaimed series to people who may not have seen them during their original runs.

One of the most interesting cases in terms of DVD sales is the animated series Family Guy. This show was pulled from Fox due to declining interest by the public. However, the DVD box sets for the first three seasons sold particularly well, spurring Fox to bring back the show.

Even current shows have DVD box sets available. A good idea is to keep an eye on the market during the season of your favorite show. By the time the current season ends, the previous season is usually available in a DVD collector's set. This will allow you to watch your favorite episodes again and again.