The main function of a dictionary is to provide definitions and explanations of words, serving as a reference tool for language users. It typically includes information such as the pronunciation, grammatical category, synonyms, antonyms, and etymology of words. Dictionaries can be monolingual, offering definitions in a single language, or bilingual, translating words between two languages. They are essential for writers, students, and anyone looking to improve their language skills, expand their vocabulary, or clarify the meanings of unfamiliar terms. The use of dictionaries helps enhance communication, comprehension, and language proficiency.