A Mansard roof is a four-sided roof design characterized by two slopes on each side. The lower slope is steeper, while the upper slope is more gentle. This unique structure allows for additional living space in the attic, making it a popular choice for residential buildings, especially in urban areas. The style is named after the French architect François Mansart, who popularized it in the 17th century. Mansard roofs are often associated with the Second Empire architectural style, which features ornate details and a distinctive silhouette, contributing to their aesthetic appeal in various architectural designs.