This article examines the grammatical structure, semantic features, and functional significance of compound sentences in the English language. A compound sentence is formed by joining two or more independent clauses through coordinating conjunctions such as and, but, or, nor, for, so, and yet, or by using a semicolon. The study highlights the distinctive characteristics of compound sentences in comparison with simple and complex sentences, emphasizing their role in conveying logical relationships between ideas. Through illustrative examples, the article analyzes the use of compound sentences in both written and spoken discourse. Furthermore, it discusses the importance of mastering compound sentence structures in English language teaching, particularly in enhancing learners’ writing fluency, coherence, and syntactic variety. The findings suggest that a thorough understanding of compound sentences contributes significantly to effective communication and grammatical competence in English.