Morphology is the branch of linguistics that studies the structure and formation of words, including morphemes, the smallest units of meaning. It examines how morphemes combine to form words, how words change to express different grammatical functions, and how new words are created. In language teaching, understanding morphology helps learners grasp the rules of word formation, recognize patterns, and expand their vocabulary. Activities might include analyzing word roots, prefixes, and suffixes, as well as practicing word formation and usage in context.