Phonetics and phonology is an introduction to the study of speech sounds and the equivalent in signed languages. Phonetics investigates physical properties of language, including sounds and gestures, their acoustic and perceptual properties, how to categorize them, and how they pattern in human language. Phonology investigates cognitive properties of language, the mental system that organizes and represents sounds and signs, and how sounds and signs interact with one another. We will explore data from languages around the world, learn how to annotate and interpret the data, and practice developing analyses to account for patterns in linguistic data.