He is particularly known for his series of Ready-Mades [title used on a Post-Bonzos single] - art based on everyday or "found" objects - and for saying that an object is art if an artist says it is. His Dadaist ideas thus led to pop art in the late 1950s and 1960s.
One of the Ready-Mades is titled The Bride Stripped Bare By Her Bachelors, Even (1923) [inspired a title on Keynsham - actually one of the possible translations of the French title].
A good place to see some of his work is in Tate Modern in London.