An apse is a semicircular or polygonal recess typically found at the eastern end of a church. It is often where the altar is located, serving as a focal point for worship. The design of an apse can vary, but it usually features a vaulted ceiling and is often adorned with decorative elements like mosaics or stained glass. In Romanesque and Gothic architecture, the apse plays a significant role in the overall structure of the building. It enhances the acoustics and visual appeal of the space, contributing to the spiritual atmosphere. The term is also associated with other religious buildings, such as cathedrals and basilicas.