A proscenium stage is a type of theater stage that features a framed opening, known as the proscenium arch, which separates the audience from the performance area. This design allows the audience to view the action from a fixed perspective, creating a "picture frame" effect. It is commonly used in traditional theaters and is ideal for showcasing elaborate sets and costumes. The proscenium stage typically includes a backstage area where actors can prepare and props can be stored. This setup allows for smooth scene changes and enhances the overall production quality. Many famous plays and musicals, such as those by William Shakespeare or Andrew Lloyd Webber, are performed on proscenium stages.