Street art is the voice of the streets. It is an age-old cultural phenomenon which brings art out of the galleries into public space. This is an ephemeral art form and traditionally there was no price tag to it. But over time, like most things, globalization and the Internet helped commercialization of street art too. In the face of the ubiquitous advertising billboards and paid-for public messages, street art has survived the time and has even proliferated.
 Street Art and the Street Artist
Street art began as a medium for the disenfranchised with roots in rebellion. It is art of the people without a voice and for whom this is the only way to voice themselves. Nevertheless, the artistic and inspirational qualities of street art have been appreciated universally. There is also the socially-conscious street art which brightens a community and stimulates discussion.
There are diverse reasons why people take to street art. They include desire to say something, desire for fame, desire to create beauty and to share it with the community. Street art comes in different forms. Somewhere it is two-dimensional while others play deftly with the third dimension Amazing 3 D Murals. Some motivate people to reconsider their role in society, while many are just cool. Some forms of art like Street Installations aim at subverting typical images of people and the city.
Street artists are also receiving support of their governments for promotion of street art. In the early stages, street performers were not considered real artists, but today every year hundreds of art festivals are being held in different cities of the world to encourage street artists. See Chalk drawings of an English artist who's famous for his art on the pavement of France, England, Germany, USA, Australia and Belgium.
 Global Popular Culture
Worldwide more and more people are taking part in street art. There are now magazines devoted to street artists and many books are written on them. With the coming of the Internet street artists are getting faster recognitions and are often invited to other cities or countries to perform their art. Visit Wooster Collective, a website dedicated to showcasing and celebrating ephemeral art placed on streets in cities around the world.
 3-D Street Art
Street art has morphed into 3-D street art. See the World’s largest 3-D Street Art by German street painter, Edgar Muller and a team of artists. Such paintings in chalks, pastels and water colors have become hugely popular worldwide with hundreds of admirers flocking to see. Also visit Amazing 3D Graffiti Artists: Street Painting and Sidewalk Chalk Art for visual representations of great works of street artists the world over. Many fans of street painting are viewing the 3-D street paintings and videos Street Paintingof American street painting artist Rod Tryon, a long time street painter, Rod Tryon. Rod has been street painting for over twenty years and has been creating engaging 3-D street paintings since 1996 at public festivals and corporate events in the USA and internationally.
 Guerilla Marketing with Street Art
Images and message against the backdrop of the dirt and grime of urban subways are often more compelling than framed billboards. Sometimes a group of urban artists clean up city walls and leave behind marketing slogans and images of renowned companies.
 Street Art Stickers
Stickers are placed in every part of the street, but those placed on traffic signs, stoplights, drips and poles are most popular. Street stickers can be considered both as creative art and vandalism. Street stickers are absurd, grotesque, ironic or funny. They portray comic characters, animals in various positions, but are also based on political or social themes like fuel consumption or globalization Stickers are more effective if placed in city centers and in areas frequented by young people.
See examples of Street Art Stickers.
 Graffiti as a Street Art Form
Grafitti, which is scratching, scrawling and painting of lettering on the walls, is often considered unsightly and illegal. See a sampling of subway graffiti. Grafitti has existed since the times of the ancients Greeks and Romans and its forms include everything from scratching to the modern spray painting of walls.
 Reverse Grafitti
Though graffiti is generally considered subversive and hence illegal, many artists have been able to be subversive by remaining within the law. One such approach is Reverse Graffiti, which in spite of stirring up controversies, manages to keep the artist out of trouble.
Alexandre Orion, a Brazilian street artist, in a typical example of reverse graffiti, lined up skulls in a São Paulo transport tunnel and created a graphic charnel house. By scraping off layers of black soot deposited on those walls he created beautiful images to present death in the lively city of Sao Paulo. His objective was to remind car drivers about the impact of emissions.
 Pavement Drawings
Pavement drawings are drawings on the flat pavement surface executed so deftly that they look realistic. See some samples of pavement drawings by an anonymous artist 
 Relevance of Street Art
Relevance of street art is unlikely to diminish as, unlike most other forms of art, it can be enjoyed by the entire society and yet has the power to forge common bonds among sections of people. Acceptance of street art will remain as long as it maintains its participatory role.. Street art has the power of engaging the larger population in art appreciation. However ephemeral, it is still power to the people.
A recent development in the street painting art form in the twenty first century is the use of user generated video, blogging, and podcasting of street painting artists at all levels of ability and their fans worldwide. This new technological advance offers opportunity for all street painting, artists, festivals, and fans to allow a window not only to their latest image or festival appearance but a chance to let others know why they street paint and to encourage others – especially the younger generation of street painters to become known and grow in experience. Reaching the public in this way allows the performance aspects of street painting to be shared with many who do not readily have the opportunity to see street painting in person.