Graffiti are writing or drawings scribbled, scratched, or sprayed illicitly on a wall or other surface in a public place. Graffiti ranges from simple written words to elaborate wall paintings. Graffiti, consisting of the defacement of public spaces and buildings, remains a nuisance issue for cities.

Street art is visual art created in public locations for public visibility. It has been associated with the terms "independent art", "post-graffiti", "neo-graffiti" and guerrilla art.