What term refers to a collection of shops under one roof?

The term that best describes a collection of shops under one roof is a shopping mall. Shopping malls are typically large buildings or complexes that house various retail stores, dining options, and sometimes entertainment facilities, all contained within the same structure. This setup allows consumers to enjoy a range of shopping and leisure activities conveniently in one location.

This distinguishes shopping malls from other options. Outlet malls are specifically retail spaces featuring discounted brand-name goods, while shopping centres may include a wider variety of services and could be outdoor or interconnected buildings. Marketplaces often refer to open-air venues where vendors sell goods and may not have the same enclosed structure or variety of shops found in a shopping mall. Therefore, shopping mall is the most appropriate term for a collection of shops under one roof.