Why is post impressionism called post impressionism?

Post-Impressionism is called so because it emerged as a reaction to Impressionism in the late 19th century, around the 1880s. While Impressionists focused on capturing light and fleeting moments through loose brushwork and color, Post-Impressionists sought to express deeper emotions and ideas, often through more structured forms and vivid colors. This movement included artists like Vincent Van Gogh, Paul Cézanne, and Georges Seurat, who expanded the boundaries of artistic expression beyond the Impressionist style. The term reflects both its chronological position after Impressionism and its departure from its techniques and philosophies.