Surrealism was an artistic movement that brought together artists interested in expressing unconscious thoughts and dreams. It was led by Andre Breton and drew inspiration from Freudian psychoanalysis. There were two main trends - the Automatists who focused on free expression through abstraction, and the Veristic Surrealists who sought to represent unconscious images realistically. Notable Surrealist artists included Salvador Dali, Joan Miro, Rene Magritte, and Max Ernst, each with their own unique styles exploring the surreal, paradoxical nature of dreams.