An apse is a semicircular or polygonal recess typically found at the eastern end of a church or cathedral. It is often where the altar is located, serving as a focal point for worship. The design of the apse can vary, but it usually features large windows that allow natural light to illuminate the space. In architecture, the apse is an important element that enhances the overall aesthetic and spiritual experience of a building. It is commonly seen in various styles, including Romanesque and Gothic architecture, and can be adorned with intricate mosaics or frescoes that depict religious themes.