An apartment building is a structure that contains multiple residential units, typically designed for people to live in. These buildings can vary in size, from small two-story homes with a few apartments to large high-rises with hundreds of units. Each apartment usually includes essential amenities like a kitchen, bathroom, and living space. Apartment buildings often provide shared facilities, such as laundry rooms, gyms, or recreational areas. They are commonly found in urban areas where space is limited, allowing more people to live close together. Residents may rent or own their apartments, depending on the building's ownership structure.