German Expressionism was an artistic style in early 20th century Germany that depicted subjective emotions rather than objective reality through techniques like distortion, exaggeration, and fantasy. Expressionist artists explored dramatic and emotional themes using expressive color and line. The style was notable for its harshness and boldness, aiming to convey mental states through disconnected and distorted sets. While it captured the suffering of post-WWI Germany, Expressionism declined in the 1920s and its artists moved to Hollywood as the style lost popularity.