The Chicago Manual of Style is a widely used guide for writing and publishing in the United States. It provides comprehensive rules for grammar, punctuation, and citation, making it essential for authors, editors, and researchers. The manual covers various writing styles, including notes and bibliography and author-date formats, catering to different disciplines. First published in 1906, the manual has undergone numerous revisions to adapt to changes in language and publishing practices. It is often used in academic settings, particularly in the humanities, and serves as a standard reference for many publishers and institutions.