Simultaneous Release -Simultaneous Release occurs when a movie (or other programming) is distributed in different ways upon its initial release. Traditionally movies are released first in movie theaters. A DVD of the movie is offered later. Later on still the movie might be offered via pay per view and/or video on demand, (such as HBO, Starz, etc.,) premium TV networks then finally Internet and free-to-air television (such as NBC, CBS, Fox & ABC.) The theory is that this type of staggered release gives each distribution channel a "window" in which to profit from the movie.

With Simultaneous Release, the movie is simultaneously distributed via more than one of the above channels when initially released. This scenario is vehemently opposed by the theater industry but smaller distributors might like it as a shorter period of advertising is needed.
https://en.wikipedia.org/wiki/Simultaneous_release