A rounded arch is a curved architectural feature that forms a semicircular shape at the top. It is commonly used in buildings and bridges to distribute weight evenly, allowing for larger openings without compromising structural integrity. This design has been utilized since ancient times, notably in Roman architecture. Rounded arches can be found in various styles, including Romanesque and Gothic architecture. They are often made from materials like stone or brick and can enhance the aesthetic appeal of a structure. The rounded shape also helps in redirecting forces downwards, making it a practical choice for architects and builders.