"The Cambridge Grammar of the English Language" is a comprehensive reference book that explores the structure and usage of the English language. Authored by Rodney Huddleston and Geoffrey K. Pullum, it provides detailed explanations of grammar rules, syntax, and semantics, making it a valuable resource for linguists, students, and educators. This grammar book stands out for its descriptive approach, focusing on how English is actually used rather than prescribing strict rules. It covers various aspects of the language, including parts of speech, sentence structure, and punctuation, offering insights into both standard and non-standard forms of English.