Wasps, also known as paper wasps, get their name because their nests are made out of a paper-like material. They are brown with yellow and sometimes red markings.
Nests are the most obvious signs of a wasp infestation, and they are commonly found in gardens.
Generally, wasps are not aggressive although they will sting if they are provoked. Their sting is very painful and can prompt an allergic reaction. It is possible to use wasp repellents for your porches and decks to prevent an infestation; otherwise, you will need to contact a licensed professional to remove a nest if it's too late.