Street art is regarded as one of the largest art movements that has achieved huge popularity and is still rapidly growing as an art form. Street artworks mainly appear in urban areas and public locations such as exterior walls of buildings, highway overpasses and bridges, and remarkably define the outlook of many neighborhoods and cities all around the world. Reflections on political and social issues are often central to street art which varies from sprayed tags, through stickers and knitted fibers wrapping telephone poles to monumental painted murals covering entire buildings. Street art, to a certain extent, is connected to and encompasses graffiti art.