History

The term graffiti referred to the inscriptions, figure drawings, etc., found on the walls of ancient sepulchers or ruins, as in the Catacombs of Rome or at Pompeii. Usage of the word has evolved to include any graphics applied to surfaces in a manner that constitutes vandalism.
The earliest forms of graffiti date back to 30,000 BCE in the form of prehistoric cave paintings and pictographs using tools such as animal bones and pigments. These illustrations were often placed in ceremonial and sacred locations inside of the caves. The images drawn on the walls showed scenes of animal wildlife and hunting expeditions in most circumstances. This form of graffiti is subject to disagreement considering it is likely that members of prehistoric society endorsed the creation of these illustrations.
The only known source of the Safaitic language, a form of proto-Arabic, is from graffiti: inscriptions scratched on to the surface of rocks and boulders in the predominantly basalt desert of southern Syria, eastern Jordan and northern Saudi Arabia. Safaitic dates from the 1st century BCE to the 4th century CE.
The first known example of "modern style" graffiti survives in the ancient Greek city of Ephesus (in modern-day Turkey). Local guides say it is an advertisement for prostitution.Located near a mosaic and stone walkway, the graffiti shows a handprint that vaguely resembles a heart, along with a footprint and a number. This is believed to indicate that a brothel was nearby, with the handprint symbolizing payment.
Ancient Pompeii graffito caricature of a politician.
The ancient Romans carved graffiti on walls and monuments, examples of which also survive in Egypt. Graffiti in the classical world had different connotations than it carries in today’s society concerning content. Ancient graffiti displayed phrases of love declarations, political rhetoric, and simple words of thought compared to toady's popular messages of social and political ideals. The eruption of Vesuvius preserved graffiti in Pompeii, including Latin curses, magic spells, declarations of love, alphabets, political slogans and famous literary quotes, providing insight into ancient Roman street life. One inscription gives the address of a woman named Novellia Primigenia of Nuceria, a prostitute, apparently of great beauty, whose services were much in demand. Another shows a phallus accompanied by the text, 'mansueta tene': "Handle with care".
Disappointed love also found its way onto walls in antiquity:

Quisquis amat. veniat. Veneri volo frangere costas
fustibus et lumbos debilitare deae.
Si potest illa mihi tenerum pertundere pectus
quit ego non possim caput illae frangere fuste?

Whoever loves, go to hell. I want to break Venus's ribs
with a club and deform her hips.
If she can break my tender heart
why can't I hit her over the head?

-CIL IV, 1284.
The satirical Alexamenos graffito is believed to be the earliest known representation of Jesus.
Historic forms of graffiti have helped gain understanding into the lifestyles and languages of past cultures. Errors in spelling and grammar in this graffiti offer insight into the degree of literacy in Roman times and provide clues on the pronunciation of spoken Latin. Examples are CIL IV, 7838: Vettium Firmum / aed quactiliar rog. Here, "qu" is pronounced "co." The 83 pieces of graffiti found at CIL IV, 4706-85 are evidence of the ability to read and write at levels of society where literacy might not be expected. The graffiti appear on a peristyle which was being remodeled at the time of the eruption of Vesuvius by the architect Crescens. The graffiti was left by both the foreman and his workers. The brothel at CIL VII, 12, 18-20 contains over 120 pieces of graffiti, some of which were the work of the prostitutes and their clients. The gladiatorial academy at CIL IV, 4397 was scrawled with graffiti left by the gladiator Celadus Crescens (Suspirium puellarum Celadus thraex: "Celadus the Thracian makes the girls sigh.")
Another piece from Pompeii, written on a tavern wall about the owner of the establishment and his questionable wine:

Landlord, may your lies malign
Bring destruction on your head!
You yourself drink unmixed wine,
Water sell your guests instead.

It was not only the Greeks and Romans that produced graffiti: the Mayan site of Tikal in Guatemala also contains ancient examples. Viking graffiti survive in Rome and at Newgrange Mound in Ireland, and a Varangian scratched his name (Halvdan) in runes on a banister in the Hagia Sophia at Constantinople.These early forms of graffiti have contributed to the understanding of lifestyles and languages of past cultures.
Graffiti, known as Tacherons, were frequently scratched on Romanesque Scandanavaian church walls.
When Renaissance artists such as Pinturicchio, Raphael, Michelangelo, Ghirlandaio or Filippino Lippi descended into the ruins of Nero's Domus Aurea, they carved or painted their names and returned with the grottesche style of decoration. There are also examples of graffiti occurring in American history, such as Signature Rock, a national landmark along the Oregon Trail.
Later, French soldiers carved their names on monuments during the Napoleonic campaign of Egypt in the 1790s. Lord Byron's survives on one of the columns of the Temple of Poseidon at Cape Sounion in Attica, Greece.

1 of the five saints

Fred Brathwaite , more popularly known as Fab 5 Freddy, is an American Hip hop historian, Hip hop pioneer and most important a former graffiti artist. He was active in New York City in the 1970s and early 1980s, and later hosted the first hip-hop music video show on TV, "Yo! MTV Raps".
As a young teenager in the 1970s Fab 5 Freddy was a member of the Brooklyn based graffiti group "The Fabulous 5." He got his name for consistent graffiti "bombing" of the number 5 train on the IRT. Outside of the Fabulous 5 group, in 1980, he painted a subway train with cartoon style depictions of giant Campbell Soup cans, after Andy Warhol. In the late 1970s and early 1980s he was an unofficial bridge between the uptown graffiti and early rap scene and the downtown art and punk music scenes.
At the end of 1980, Glenn O'Brien cast Freddy, along with fellow Lower East Side graffiti writer Lee Quinones, in the film New York Beat (later released as Downtown 81). That film showcased artist Jean-Michel Basquiat in his Lower Manhattan environment and the culture that surrounded it. Shortly after, Freddy began production along with filmmaker Charlie Ahearn on his film Wild Style (1982), which showcased artist Lee Quinones in the Uptown, Manhattan environment of the Bronx and the music that surrounded it. In April 1981, Freddy helped curate (with Futura 2000 and Keith Haring) the graffiti-related art show "Beyond Words" at the Mudd Club, which contained their own work along with Jean-Michel Basquiat, Rammellzee, Afrika Bambaataa, and others.This was the first time the many members of the Bronx hip-hop scene had appeared in a Downtown NYC art context.

he broght the art to the streets

Andrew Zephyr Witten is a graffiti artist, lecturer and author from New York City. He began creating graffiti in 1975 and first signed using the name "Zephyr" in 1977. He has been identified as a graffiti "elder", who along with Futura 2000, Blade, PHASE 2, Lady Pink and TAKI 183 invented styles and standards "that continue to be used and expanded upon today"
Much of Zephyr's original work was applied on subway trains. Mr. Witten has commented on this period of his work:

"We felt we understood the trains more than the Transit Authority. Teenagers were running the system. We decided when, where, how much we wrote. Graffiti showed that the Transit Authority was not in control."
Witten was part of the first wave of graffiti artists to make the transition to galleries, collectors and commercial work. In the early 80s, he showed at NYC galleries specialized in graffiti, such as the FUN Gallery and 51X. His art was part of a five-man show including Fab Five Freddy, Dominique Philbert, Futura 2000 and Dondi White that toured Japan in 1983.
His works can be seen in the Hip-hop culture documentary Style Wars and he was featured as himself in the landmark hip-hop motion picture Wild Style. He is co-author of a 2001 biography of fellow graffiti artist, Dondi White: Dondi White Style Master General: The Life of Graffiti Artist Dondi White. He is interviewed in the 2005 DIY graffiti video The Art of Storytelling, where he talks about fallen graffiti artist Nace. He was featured in the documentary Bomb It.

Graffiti is often seen as having become intertwined with hip hop culture and the myriad of international styles derived from New York City Subway graffiti (see below). However, there are many other instances of notable graffiti this century. Graffiti has long appeared on railroad boxcars and subways. The one with the longest history, dating back to the 1920s and continuing into the present day, is Texino. During World War II and for decades after, the phrase "Kilroy was here" with accompanying illustration was widespread throughout the world, due to its use by American troops and its filtering into American popular culture. Shortly after the death of Charlie Parker (nicknamed "Yardbird" or "Bird"), graffiti began appearing around New York with the words "Bird Lives". In the sixties American graffiti proclaiming that "Yossarian lives!", was briefly popular, a reference to the protagonist of Joseph Heller's novel Catch-22. The student protests and general strike of May 1968 saw Paris bedecked in revolutionary, anarchist, and situationist slogans such as L'ennui est contre-révolutionnaire ("Boredom is counterrevolutionary") expressed in painted graffiti, poster art, and stencil art. In the U.S. at the time other political phrases (such as "Free Huey" about Black Panther Huey Newton) became briefly popular as graffiti in limited areas, only to be forgotten. A popular graffito of the 1970s was the legend "Dick Nixon Before He Dicks You," reflecting the hostility of the youth culture to that U.S. president.

Rock and roll graffiti is a significant sub genre. A famous graffito of the 20th century was the inscription in the London subway reading "Clapton is God". The phrase was spray-painted by an admirer on a wall in an Islington Underground station in the autumn of 1967. The graffiti was captured in a photograph, in which a dog is urinating on the wall. Graffiti also became associated with the anti-establishment punk rock movement beginning in the 1970s. Bands such as Black Flag and Crass (and their followers) widely stenciled their names and logos, while many punk night clubs, squats and hangouts are famous for their graffiti. In the late 1980s the upside down Martini glass that was the tag for punk band Missing Foundation was the most ubiquitous graffito in lower Manhattan, and copied by hard core punk fans throughout the U.S. and West Germany.

The modern day graffiti artist can be found with an arsenal of various materials that allow for a successful production of a piece. Spray paint in aerosol cans is the number one necessity for graffiti . From this commodity come different styles, technique, and abilities to form master works of visual graffiti. Spray paint can be found at hardware and art stores and come in virtually every color.

Stencil graffiti, originating in the early 1980s, is created by cutting out shapes and designs in a stiff material (such as cardboard or subject folders) in order to form an overall design or image^[. The stencil is then placed on the canvas gently and with quick, easy strokes of the aerosol can, the image begins to appear on the intended surface. This method of graffiti is popular amongst artists because of its swift technique that requires very little time. Time is always a factor with graffiti due to the constant threat of getting caught by law enforcement.

Modern graffiti art often incorporates additional arts and technologies. For example, Graffiti Research Lab has encouraged the use of projected images and magnetic light-emitting diodes as new media for graffiti writers. The Italian artist Kaso is pursuing regenerative graffiti through experimentation with abstract shapes and deliberate modification of previous graffiti artworks. Yarnbombing is another recent form of graffiti. Yarnbombers occasionally target previous graffiti for modification.