This document provides an overview of the study of language and its various subfields. It discusses how language can be studied at different levels, from sounds (phonetics and phonology) to words (morphology) to sentences (syntax) to meanings (semantics) to social and cultural aspects (pragmatics, sociolinguistics). It also examines how language changes over time (historical linguistics), how it evolved (evolutionary linguistics), and how it is acquired and represented mentally (psycholinguistics). The document aims to illustrate the breadth and complexity of the field of linguistics.