A patio is a ground-level outdoor living area made of materials such as concrete, pavers, or stone. A deck, on the other hand, is a raised outdoor platform typically made of wood or composite materials. Patios are typically less expensive than decks, and can be easier to maintain. Decks are a good choice for uneven terrain or multi-level outdoor spaces, and can offer a greater variety of design options. Ultimately, the choice between a patio and a deck will depend on factors such as budget, desired aesthetic, and site conditions.