Expressionism was an artistic movement that portrayed inner emotions, spiritual independence, and psychological states through distorted figures and intense use of color. Artists expressed subjective experiences rather than objective reality. Common themes included anxiety, alienation, and violence. Major expressionist groups included Der Blaue Reiter which emphasized intuition and symbolism, and Die Brücke which linked cultures and past/present. Notable artists like Edward Munch, Ernst Kirchner, and Franz Marc used expressive techniques like unnatural color and form to portray universal human experiences in a psychological manner that shocked audiences.