Dada and Surrealism emerged as radical art movements in the early 20th century, challenging traditional artistic norms. Born from the chaos of World War I, Dada embraced irrationality and absurdism, while Surrealism explored the unconscious mind and dream-like imagery. These movements revolutionized artistic expression, influencing various art forms and cultural spheres. Key figures like Marcel Duchamp and Salvador Dalí pushed boundaries with unconventional techniques and thought-provoking works, leaving a lasting impact on modern and contemporary art.