A duplex is a type of residential building that consists of two separate living units, typically sharing a common wall. Each unit usually has its own entrance, kitchen, and bathroom, making them self-contained homes. Duplexes can be found in various architectural styles and are often designed to accommodate families or individuals looking for rental income. Duplexes are popular in urban areas where space is limited, as they maximize land use while providing separate living spaces. They can be owned by a single homeowner who rents out one unit or by two families living side by side. This arrangement offers a balance of privacy and community.