Before the advent of VHS tapes and DVDs, the only way a person could see a movie was to go to the theater when it was showing. (A lucky few had their own home projectors, but they did not invite the whole neighborhood.) If no theater was showing the movie, you could not see it. This is part of the reason why so many thousands of films have been lost and forgotten over the years--even quite a few that were acknowledged as being great.
Nowadays thousands upon thousands of films have been re-released in the VHS and DVD formats, giving them renewed life. With action adventure VHS tapes, you can find Errol Flynn videos next to Arnold Schwarzenegger videos. Plus, many of the latest movies are still being released on VHS.
Though many people proclaim that the digital revolution will decimate the VHS market, it is in several ways aiding it. Digital manipulation and effects are used to clean up aging prints of old films to make them look like new again--or as new as possible for a film from the 1930s. Cleaned up VHS versions of older action adventure films often look better than they did when they were first released.