Dada, or Dadaism, was an art movement during the 20th century. They where a largely Jewish movement from Switzerland, opposed to the Futurists, machines and war. They where also anti-(Not avant guard) art, as they thought it was a front put on by society.
Dadaist art was radical and surreal, made up of collage and nonsense, which they used to show how society didnt make sense.
Tristan Tzara used photomontage and collage.
Picabia also used the same methods, to create collages of machinery and people.
John Heartfield was a german artist, during ww1 who changed his name to an english one, in protest to the nazis, who he made propaganda images against. Like the other artists he used collage and photomontage.
George Grosz was a artist who took inspiration from Berlin society to make paintings and charactertures of people.
Punk is also somewhat influenced by Dadaism, in that it can be surreal and uses the same methods. Jamie Reid did some artwork for the band The Sex Pistols.