This document provides an introduction to applied linguistics. It defines applied linguistics as an interdisciplinary field that addresses real-world language-related problems in a practical way using empirical methods. It discusses the scope of applied linguistics, including language teaching, language planning and policy, language pathology therapy, and more. The document also outlines the process applied linguists use to address language problems, including identifying the problem, asking questions, measuring the problem, consulting relevant disciplines, proposing solutions, implementing solutions, and assessing results. It provides an example of how this process might be applied to address a country's literacy problem.