A canopy is an overhead roof or else a structure over which a fabric or metal covering is attached, able to provide shade or shelter. A canopy can also be a tent, generally without a floor.
The 3d nature of most canopy structures is quite unique as a building form, so it quickly forms a visual focus of attention. If you use a more traditional structure, such as a tiled roof, or a flat glass or polycarbonate canopy, these are unlikely to stand out so clearly. In all potential canopy locations, you have to take into account the type of structure you wish to use. If you are connecting to a building, you need to know that there is adequate supporting structure to accommodate the expected loadings.
Architectural canopies include projections giving protection from the weather, or merely decoration. Such canopies are supported by the building to which they are attached and often also by a ground mounting provided by not less than two stanchions, or upright support posts.