A pergola is an architectural structure that can be supported by columns, trees, or other structures to provide shade, and shelter from the elements for outdoor seating. Pergolas may be constructed in a variety of materials including: wood, vinyl, metal and WPC (wood-plastic composite).
I love the way this one is built on the deck, but not the entire deck. So if you want some degree of shade, you can sit under the pergola, but if you want full sun, you can move to an open space. I have a friend that has a pergola over their patio, and they have a weather-proof ceiling fan installed in it. Provides a nice breeze on warm or hot summer days.
This pergola is ideal for summer barbecues because it offers the perfect setting under a shady spot (notice the trees above it). It also has space enough to seat many people together under it. Plus this is a beautiful deck!