Engagement refers to a learner's interest in their own learning. Engaged students care about what they are learning and spend the time necessary to learn more. Learner engagement leads to increased achievement in a course and also increased satisfaction with the learning experience. This chapter explores elements of engagement from both a researcher and practitioner perspective. The authors explore the definition of engagement along with an explanation of the most influential theories of engagement. They also explain what classroom practices are most likely to build engagement and suggest future research directions.