A secondary suite is a self-contained living space within a larger residential property, often referred to as an accessory dwelling unit (ADU). These suites typically include a separate entrance, kitchen, bathroom, and living area, allowing for independent living. They can be found in basements, attics, or as separate structures on the same lot. Secondary suites are popular for various reasons, including providing additional rental income for homeowners or housing for family members. They can help address housing shortages in urban areas by maximizing the use of existing properties while maintaining neighborhood character.