This text discusses the science of phonetics and its relation to other branches of linguistics. It covers the phonetic system of a language, the branches of phonetics, and the connection of phonetics with other branches of linguistics. It also delves into the segmental level, vocalic subsystem, consonantal subsystem, as well as the suprasegmental or prosodic level which includes patterns of stress and intonation in a language such as pitch, stress, rhythm, tempo, and pauses.