A door is a movable structure used to open and close off an entrance, typically consisting of a panel that swings on hinges or that slides or rotates inside a space.

When open, doors admit ventilation and light. The door is used to control the physical atmosphere within a space by enclosing the air drafts, so that interiors may be more effectively heated or cooled. Doors are significant in preventing the spread of fire. They also act as a barrier to noise.

They are also used to screen areas of a building for aesthetics, keeping formal and utility areas separate. Doors also have an aesthetic role in creating an impression of what lies beyond. Doors are often symbolically endowed with ritual purposes, and the guarding or receiving of the keys to a door, or being granted access to a door can have special significance. Similarly, doors and doorways frequently appear in metaphorical or allegorical situations, literature and the arts, often as a portent of change.

Architectural doors have numerous general and specialized uses. Doors are generally used to separate interior spaces (rooms, closets, etc.) for privacy, convenience, security, and safety reasons. Doors are also used to secure passages into a building from the exterior for reasons of safety and climate control.

Kristen Anne Bell (born July 18, 1980) is an American actress. In 2001, she made her Broadway debut as Becky Thatcher in The Adventures of Tom Sawyer. After moving to Los Angeles, Bell landed various television guest appearances and small film parts before appearing in a lead role in the David Mamet film Spartan. Her first film role was an uncredited appearance in Polish Wedding. She gained fame and critical praise as the title role on the acclaimed television series Veronica Mars from September 2004 to May 2007.

During her time on Veronica Mars, Bell appeared as Mary Lane in the film Reefer Madness: The Movie Musical, a reprise of the role she had played in the New York theatrical production of the eponymous musical upon which the film was based. She also portrayed the lead role in Pulse, a remake of a J-Horror film. In 2007, she joined the cast of Heroes, playing the character Elle Bishop, and Gossip Girl as the off-screen titular narrator. In 2008, she played Sarah Marshall in the comedy film Forgetting Sarah Marshall. She has since appeared in a number of comedy films, such as Fanboys, Couples Retreat, and When in Rome. Bell was also the voice of Cora in Astro Boy and is the voice and face of Lucy Stillman in the Assassin's Creed video game series. Bell has received a Satellite Award and Saturn Award, and has been nominated several times for Television Critics Association Awards and Teen Choice Awards.^{[citation needed]}

Santino Fontana is an American stage actor, director, and composer. Fontana graduated Richland High School in Richland, WA in 2000. His Broadway debut was Sunday in the Park with George in 2007. Fontana originated the role of Tony in the Broadway production of Billy Elliot from October 1, 2008 to July 4, 2009. He was awarded the 2010 Drama Desk Award for Best Featured Actor in a Play for his work in Brighton Beach Memoirs. He is a graduate of the University of Minnesota/Guthrie Theater BFA Actor Training Program, class of 2004.