A pergola and an arch are both structures that can add aesthetic value to your outdoor space, but they differ in design, function, and usage. A pergola is a larger, freestanding structure often used to provide shade over a deck or patio. It's typically rectangular or square in shape and features a slatted roof that can be left open or covered for additional shade or protection from the elements. Pergolas are often used as outdoor living spaces and can be decorated with climbing plants, lights, and outdoor furniture.
On the other hand, an arch is a smaller, curved structure, often used as an entryway or a focal point in a garden or yard. Arches are usually designed for climbing plants to grow over them, creating a natural, beautiful passageway. They are often made of metal or wood and are less likely to be used as a gathering or seating area, unlike a pergola.
In essence, while both pergolas and arches can enhance the beauty of your outdoor spaces, pergolas are more focused on providing a functional, shaded area for relaxation or entertainment, while arches serve more as decorative elements within a landscape.