One roof containing a number of shops is a

A roof containing a number of shops is a department store. A department store is a large retail establishment that offers a wide range of products organized into separate departments or sections. Each department within a department store is typically dedicated to a specific category of goods, such as clothing, electronics, or home goods. The concept of a department store originated in the 19th century as a way to offer consumers a wider range of products in a single location. Today, department stores are still popular shopping destinations because they offer convenience and a large selection of products. Some department stores also offer additional services, such as personal styling, alterations, and gift wrapping.