Normal science is one of the core concepts in Kuhn’s philosophy, and its implications have been the target of both critical approaches and friendly attempts at analytic elucidation. This chapter aims to clarify the role of normal science in Kuhn’s philosophy, showing that some basic features of normal science, such as problem solving and the lack of criticism toward basic commitments, lead to a successful explanation of scientific progress. To do this, the chapter examines normal science, emphasizing the main features of the concept, the role it plays in the notion of science defended by Kuhn, and how it allows us to articulate the social and cognitive dimensions of scientific practice.