This chapter explores the relationship between learning engagement and learning outcomes, focusing on how cognitive, emotional, and behavioral engagement dimensions predict academic success. It highlights the crucial role of learning engagement in improving student performance, emphasizing its impact on social interaction, cognitive development, and emotional experience. The chapter reviews recent research that links engagement with learning outcomes and examines the influence of external factors such as social networks, emotional support, and peer interactions on engagement. In conclusion, the chapter provides valuable insights into the mechanisms behind learning engagement and its direct impact on learning outcomes. It offers a foundation for future educational interventions and teaching practices in the AI era.