A fourplex is a type of residential building that contains four separate living units. Each unit typically has its own entrance, kitchen, and bathroom, allowing for independent living. Fourplexes are often found in urban areas and can be an attractive option for both investors and homeowners looking to generate rental income. Investing in a fourplex can provide financial benefits, as the owner can live in one unit while renting out the others. This setup can help cover mortgage payments and other expenses. Additionally, fourplexes are considered a form of multi-family housing, which can contribute to community density and diversity.