Phonology (Greek phone = voice/sound and logos = word/speech), is a subfield of linguistics
closely associated with phonetics.
Whereas phonetics is about the physical production and perception of sounds of speech,
phonology describes the way sounds function – within a given language or across languages.
Phonology is the study of how sounds are organized and used in natural languages.
The phonological system of a language includes
– an inventory of sounds and their features, and
– rules which specify how sounds interact with each other.
Phonology is just one of several aspects of language. It is related to other aspects such as
phonetics, morphology, syntax, and pragmatics.