Phonology is the study of the sound system of languages. It is a huge area of language theory and it is difficult to do more on a general language course than have an outlineknowledge of what it includes. In an exam, you may be asked to comment on a text that you are seeing for the first time in terms of various language descriptions, of which phonology may be one. At one extreme, phonology is concerned with anatomy andphysiology - the organs of speech and how we learn to use them. At another extreme, phonology shades into socio-linguistics as we consider social attitudes to features of sound such as accent and intonation. And part of the subject is concerned with finding objective standard ways of recording speech, and representing this symbolically.
For some kinds of study - perhaps a language investigation into the phonological development of young children or regional variations in accent, you will need to use phonetic transcription to be credible. But this is not necessary in all kinds of study - in an exam, you may be concerned with stylistic effects of sound in advertising or literature, such asassonance, rhyme or onomatopoeia - and you do not need to use special phonetic symbols to do this.
Phonetics is the study of the sounds of language. These sounds are called phonemes. There are literally hundreds of them used in different languages. Even a single language like English requires us to distinguish about 40! The key word here is distinguish. We actually make much finer discriminations among sounds, but English only requires 40. The other discriminations are what lets us detect the differences in accents and dialects, identify individuals, and differentiate tiny nuances of speech that indicate things beyond the obvious meanings of the words.
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A phoneme is a speech sound that helps us construct meaning. That is, if we replace it with another sound (where this is possible) we get a new meaning or no meaning at all. If I