A painting style based on the practice of working outdoors (plein-air painting) and characterized by rapid brushwork and an interest in depicting transient effects of light. Impressionism originated in the early 1870s with a group of Paris-based artists, including Claude Monet, Berthe Morisot, Camille Pissarro and Auguste Renoir. Typical Impressionist subjects were landscapes and scenes of middle-class leisure.  The Impressionists organized eight group exhibitions between 1874 and 1886. Web resource here.

Berthe Morisot. Summer’s Day.  Oil on canvas. Ca. 1879. National Gallery, London.