Phonology is a branch of linguistics concerned with the systematic
organization of sounds in languages. It has traditionally focused
largely on the study of the systems of phonemes in particular
languages (and therefore used to be also called phonemics or
phonematics) but it may also cover any linguistic analysis either
at a level beneath the word (including syllable onset and rime
articulatory gestures articulatory features mora etc.) or at all
levels of language where sound is considered to be structured for
conveying linguistic meaning.