Mark Twain (1835–1910), the pen name of Samuel Clemens, was an American author and humorist best known for works like The Adventures of Tom Sawyer and Adventures of Huckleberry Finn. Twain's writing, often infused with satire and social commentary, addressed issues like racism, inequality, and the complexities of human nature. His works had a profound influence on American literature, shaping the development of realistic fiction and contributing to the nation's literary voice. Twain's wit and bold critique of society made him a key figure in shaping American cultural and social thought in the 19th and early 20th centuries.