This chapter explores the concept of innatism and its implications for language acquisition. Innatism posits that humans are born with innate cognitive structures, such as the Language Acquisition Device (LAD) and Universal Grammar (UG), which facilitate language learning. These mechanisms enable children to deduce grammatical rules and acquire language rapidly, even with limited exposure. The chapter discusses the role of rich linguistic input, naturalistic learning environments, and the importance of aligning teaching methodologies with innate language learning principles. It also addresses criticisms of innatism, such as its overemphasis on competence over performance and its underestimation of social and environmental factors. Practical applications for language teaching are highlighted, including creating immersive, interactive environments and tailoring instruction to learners' ages and proficiency levels. The chapter concludes by advocating for a balanced approach that integrates innate principles with social and cognitive strategies, ensuring a comprehensive framework for language education.