Vocabulary refers to the set of words that a person knows and uses in communication. It includes words used in speaking, writing, and understanding language. A rich vocabulary allows individuals to express their thoughts and ideas more clearly and effectively. It can also enhance reading comprehension, as knowing more words helps in understanding texts better. Building vocabulary can occur through various methods, such as reading books, engaging in conversations, and using language-learning tools. Teachers often encourage students to learn new words through activities like word games and flashcards. A strong vocabulary is essential for academic success and effective communication in everyday life.