Phonetics is the study of the actual sounds of language.Though there exist various kinds of sound in the human world, in this course we are required to use "sound" in its restricted sense. In other words, we are considering the sounds of language. Therefore we will not include sounds made by animals or vehicles in phonetics. Nor shall we take into account a person's cough or a baby's hungry cry because they are not sounds of formalized language. In our course of English phonetics we will cover the sounds that are meant to be important in communication.