Mainly, a door canopy is used to protect you from the elements. Wind, rain or shine, canopies provide shelter, so there's no more standing in bad weather while struggling to find your keys!
Canopies can also be useful for maintaining your door and keeping it in good condition, as it will be less likely to be impacted by poor weather conditions.
What's more, your canopy is a great way to decorate a doorway which is in need of an upgrade. Many of them come with beautiful, intricate designs that add an element of style, as well as being a practical method to protect you from the rain.