The fourth wall is a theater term that is also used in tv and film.
In theater, three physical walls are a part of the stage and then the 4th wall is how the audience views the play. In film and tv, the fourth wall is the camera. When a character talks to the audience, they “break the fourth wall”.
In this first teaser for Sony’s ‘Smurfs: The Lost Village’, the Smurfs break the fourth wall and the MPPA ratings band. Get introduced to Smurfette (Demi Lovato), Brainy Smurf (Danny Pudi), Hefty Smurf (Joe Manganiello) and Clumsy Smurf (Jack McBrayer) in the short fourth wall breaking teaser above.