Street art is any art developed in public spaces. The term can include traditional graffiti art work, as well as, stencil graffiti, sticker art, wheatpasting and street poster art, video projection, art intervention, guerrilla art, flash mobbing and street installations.
Whereas traditional graffiti artists have primarily used free-hand aerosol paints to produce their works with ‘tagging’ and text-based subject, street art encompasses many other media, techniques and subject matter including: LED art, mosaic tiling (e.g. Space Invader), murals, stencil art (e.g. Hutch and Blek Le Rat), sticker art, street installations (e.g K-GUY), wheatpasting (e.g. Faile and Prefab77), woodblocking, video projection, and yarn bombing.
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, Jenny Holzer and Barbara Kruger.