This document provides an overview of Expressionism, beginning with a definition that Expressionist artists painted inward psychological and emotional experiences rather than outward appearances. It then summarizes key Expressionist artists and movements, including Van Gogh and Munch's radical new style using intense colors; Die Brücke group in Germany reacting against social norms; Der Blaue Reiter group using imagination and spirituality; the influence of German Expressionism on Abstract Expressionism in the US; and individual pieces by Munch, Van Gogh, Kirchner, and Kandinsky that express inner feelings through exaggerated styles and non-representational forms.