A proscenium arch is a structural feature in a theater that frames the stage and separates it from the audience. It creates a clear boundary between the performance area and the seating, allowing for a focused viewing experience. This design often resembles a large picture frame, enhancing the visual presentation of the play or performance. The proscenium arch is commonly found in traditional theaters and is often adorned with decorative elements. It allows for various staging techniques, including the use of backdrops and stage lighting, which can enhance the overall atmosphere of the production. The term is also associated with the proscenium stage, where performances are typically presented.