The Chicago Manual of Style is a widely used style guide for writing and publishing in the United States. It provides comprehensive guidelines for grammar, punctuation, citation, and manuscript preparation, making it essential for authors, editors, and researchers. The manual covers various topics, including how to format footnotes, bibliographies, and in-text citations. First published in 1906, the Chicago Manual of Style has undergone numerous revisions to adapt to changes in language and publishing practices. It is particularly popular in the fields of history, literature, and the social sciences, offering two main citation systems: the Notes and Bibliography style and the Author-Date style.