The concept of urban art, also called street art, which is a translated version of the English expression "Street art", alludes to all the art that is made on the street, on the street and are usually activities outside the law being illegal, giving rise to controversies and confrontations between its followers and its detractors. This form of public art happens by the artist's exclusive initiative, without previous permission or assignment, and whose result is abandoned, so the work is finished. This type of urban art includes Graffiti, being the first artistic expression associated with the streets, but there are other ways of artistic expression such as posters and stickers. The objective of urban art is to try to surprise the observers since normally this type of work is carried out in public areas that are frequented enough. All the works usually carry a very striking message, this message is usually revolutionary that criticizes society above all but with a certain irony and tries to incite a social struggle, other messages are only a political criticism or a simple reflection. Unfortunately, this type of art coexists with debates about the main objective that artists have to do their works, and more currently that many of them simply harm the private space.
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