Conceptual art, which favours an engagement with ideas over the creation of the traditional art object, is associated mainly with the countercultural beliefs and challenges to authority of the 1960s and 1970s, but is very much alive today. To the key question `What is Art?`, Conceptual artists have replied -- with photographs, videos, words, performances, installations, posters, readymades and other objects -- `This could be Art`. Tony Godfrey`s account is international in scope, featuring artists ranging from Joseph Kosuth and Lawrence Weiner in the United States to Europeans Victor Burgin and Marcel Broodthaers. Godfrey`s clear and effervescent account offers a much-needed accessible explanation of this provocative art phenomenon.