Impressionism was an avant-garde art movement in the late 19th century characterized by quick, transient depictions of light and color in landscapes, figures, and still lifes. Impressionist artists, such as Monet, Renoir, and Degas, were interested in how light and time of day affected the appearance of objects and landscapes. They painted en plein air to capture the fleeting effects of light through loose brushwork and vivid colors.