Graffiti is a visual practice of expressing oneself through writing letters or drawing pictures on the wall. It is accepted as an art by some circles but considered as vandalism by some others. When we consider the shapes plotted in the walls of the craves in the ancient time, we can say that this way of expressions can go back to the primitive ages. But the impetus for modern graffiti as the art of drawing on the walls was the hip-hop youth subculture which appeared in 1970s in the USA. By doing all these work, the graffitists who define themselves as street artist, aim to communicate their feelings and ideas to the public. They also regard their art has the mission to beautify the community by adding aesthetic with their colorful designs and messages. A vast majority of graffiti artist prefer to hide their identity, but instead use nicknames and add symbols and interesting pictures to their signatures which can be numerical symbols and logos. Over the time, the dimensions of the letters used has been grown and the inner side of the letters has been filled with figures. Unique writing styles with special color preferences has been emerged.