Street art is related to graffiti art in that it is created in public locations and is usually unsanctioned, but it covers a wider range of media and is more connected with graphic design.
Where modern-day graffiti revolves around ‘tagging’ and text-based subject matter, street art is far more open. There are no rules in street art, so anything goes. However common materials and techniques include fly-posting (also known as wheat-pasting), stenciling, stickers, freehand drawing and projecting videos.
Street artists will often work in studios, hold gallery exhibitions or work in other creative areas: they are not anti-art, they simply enjoy the freedom of working in public without having to worry about what other people think.
Many well-known artists started their careers working in a way that we would now consider to be street art, for example, Gordon Matta-Clark, Jenny Holzer and Barbara Kruger.