A basement apartment is a living space located below ground level, typically within a residential building. These apartments often have separate entrances and can be fully equipped with kitchens, bathrooms, and living areas. They are popular for their affordability and can provide additional rental income for homeowners. Many basement apartments are designed to maximize natural light, featuring windows that may be at or slightly above ground level. They can vary in size and layout, and some may include amenities like laundry facilities. Landlords often convert basements into apartments to make use of otherwise unused space.