see also: Virtual Graffiti
Digital graffiti is the act of creating graffiti art using a computer visio] system. Various groups and companies have pioneered digital graffiti since technology advances made it possible. Most notably is the Graffiti Research Lab based in the US with their L.A.S.E.R. Tag system.
Any system that allows art to be created on a large scale in a similar manner to more traditional graffiti falls under the heading digital graffiti.