Expressionism is the tendency of an artist to distort reality for an emotional effect; it is a subjective art form. Expressionism is exhibited in many art forms, including painting, literature, theatre, film, architecture and music. Additionally, the term often implies emotional angst – the number of cheerful expressionist works is relatively small.

In this general sense, painters such as Matthias Grünewald and El Greco can be called expressionist, though in practice, the term is applied mainly to 20th century works.