This chapter discusses communication research by defining it as a systematic process of asking and answering questions about human communication. Researchers specialize in specific interest areas and methods, which reflect their assumptions. There are three major approaches to research - empirical, interpretive, and critical. Empirical research observes and measures from the researcher's perspective, interpretive observes and interprets from participants' perspectives, and critical examines whose interests are being advanced. The chapter provides examples of how these approaches could study an advertising campaign differently.