What exactly are street art and graffiti? For the graffiti artists, the goal is to "tag," or write their name, on the most places. Extra respect goes to those who get their tag on hard-to-reach spots, like billboards and the tops of high buildings. "If there are two graffiti artists, they will compete for fame. They might never meet but they compete because they see each others' names so much," said graffiti artist BG 183 of Tats Cru, a group of professional muralists Street art, on the other hand, usually has a political or social message and aims to encourage the viewer to think and interpret ideas. Although street art is usually illegal like graffiti, many consider it an alternative art form, valuable to the community at large