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, allowing for independent living. Duplexes can be found in various architectural styles and are popular in urban and suburban areas for their efficient use of space. Duplexes can serve different purposes, such as providing housing for multiple families or generating rental income for owners. They are often seen as a cost-effective option for homebuyers looking to invest in real estate while maintaining privacy and autonomy within their living environment.