The 19th century saw major shifts in art criticism, reflecting broader social and cultural changes. Key figures like John Ruskin, Charles Baudelaire, and Émile Zola championed new artistic movements and challenged traditional aesthetics, while the rise of photography and industrialization reshaped artistic production. This period witnessed the emergence of influential theories such as formalism, historicism, and "art for art's sake." Critics grappled with the impact of modernity on art, debating realism, impressionism, and the role of art in society. These discussions laid the groundwork for 20th-century art criticism and continue to shape contemporary discourse.