Language is power. We use language for the whole range of activities that make us human, from passion to politics; we negotiate through language in every waking moment of our lives.
Linguistics comprises different areas of specialisation:
phonetics (the study of speech sounds),
phonology (sound systems),
morphology (internal structure of words),
syntax (how words are combined into sentences),
semantics (meaning), pragmatics (meaning in relation to the way language is used),
socio-linguistics (language in its social context),
historical linguistics (language change),
universal typology (language universals and differences),
acquisition (how 1st and 2nd languages are learned), and
applied linguistics (the application of linguistics to language teaching and other professional activities).