A phonologist is a linguist who studies the sound systems of languages. They focus on how sounds function and pattern within a particular language, examining aspects like phonemes, which are the smallest units of sound that can change meaning. Phonologists analyze how these sounds interact and how they are organized in speech. Phonologists often compare different languages to understand universal principles of sound organization. Their work can help in various fields, including language education, speech therapy, and linguistic research. By understanding sound patterns, phonologists contribute to our knowledge of human communication and language development.