What is the similarity between Impressionism and Expressionism?

Characteristics of Impressionist paintings include visible brush strokes, open composition, emphasis on light in its changing qualities (often accentuating the effects of the passage of time), ordinary subject matter. Expressionism sought to express the meaning of "being alive" and emotional experience rather than physical reality. It is the tendency of an artist to distort reality for an emotional effect; it is a subjective art form. In short: They are very different, not similar. Impressionism shows the light and color of a subject (landscape etc). Expressionism distorts form and color to express a feeling.