Colorful graffiti painted over street art mural.
Graffiti are writing or drawings that have been scribbled, scratched, or painted illicitly on a wall or other surface, often within public view. Graffiti range from simple written words to elaborate wall paintings, and they have existed since ancient times
Spray paint and marker pens have become the most commonly used graffiti materials. In most countries, marking or painting property without the property owner's permission is considered defacement and vandalism, which is a punishable crime.
Gangs use their own form of graffiti to mark territory or to serve as an indicator of gang-related activities.