This book explains the basic principles of phonetics, phonology, as well as phonetic/phonological correction, while also including information related to the language acquisition process. It is aimed at students of Pedagogical Departments or TEI Departments of Speech Therapy who study articulation and pronunciation correction issues, specialists such as psychologists who are interested in understanding the phonological structure of Greek in order to better address cases of speech problems, or speech therapists who wish to enhance their theoretical knowledge of articulation and phonology issues or theories of phonetic structure. Finally, it may be useful for foreign language teachers who wish to emphasize correct pronunciation issues or for preschool and early primary school teachers who are interested in enriching their teaching with activities that enhance phonological awareness, practice the articulation of their students, and facilitate preparation for reading and writing.