This document is an introduction to the field of linguistics, covering topics such as phonetics, phonology, morphology, syntax, semantics, historical linguistics, language acquisition, and the relationship between language and society. It is intended as a textbook for students new to the study of linguistics, providing foundational knowledge across the main areas of the discipline in accessible chapters contributed by different authors. The goal is to give readers a broad overview of linguistics as an interdisciplinary field involving the scientific study of human language.