Impressionism was a 19th-century art movement that began as a loose association of Paris-based artists exhibiting their art publicly in the 1860s. The name of the movement is derived from the title of a Claude Monet work, Impression, Sunrise (Impression, soleil levant), which provoked the critic Louis Leroy to coin the term in a satiric review published in Le Charivari.

Characteristics of Impressionist painting 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, the inclusion of movement as a crucial element of human perception and experience, and unusual visual angles.

The emergence of Impressionism in the visual arts was soon followed by analogous movements in other media which became known as Impressionist music and Impressionist literature.

Impressionism also describes art created in this style, but outside of the late 19th century time period.

Post-Impressionism is the term coined by the British artist and art critic Roger Fry in 1910, to describe the development of European art since Manet.

John Rewald, one of the first professional art historians to focus on the birth of early modern art, limited the scope to the years between 1886 and 1892 in his pioneering publication on Post-Impressionism: From Van Gogh to Gauguin (1956): Rewald considered it to continue his History of Impressionism (1946), and pointed out that a "subsequent volume dedicated to the second half of the post-impressionist period" - Post-Impressionism: From Gauguin to Matisse - was to follow, extending the period covered to other artistic movements of the late 19th and early 20th centuries — to artistic movements based on or derived from Impressionism.