What type of structure is often situated under ground level in a home?

A basement is specifically designed as a structure that is usually located below ground level in a home. This area typically serves as additional living space, storage, or sometimes as a utility area. Basements are built into the foundation of the house and can be partially or fully below ground, providing a climate-controlled environment that is often used for various purposes, from recreational rooms to laundry facilities.

In contrast, while garages can be partially below ground in some designs, they are not universally located underground as basements are. Utility rooms can exist at any level in a house and are not specifically underground. Living rooms are generally situated above ground as the main area for relaxation and social gatherings. Thus, the characteristic of being located below ground makes basements the correct answer.