This article provides an overview of the scholarship of teaching and learning (SoTL) in mathematics. It describes the origins of SoTL in higher education and distinguishes SoTL from good teaching, scholarly teaching, and mathematics education research. It includes a widely adopted taxonomy of SoTL questions and presents several examples of SoTL questions that have been investigated and made public. The heart of the article is a specific example of how a "teaching problem" can launch a SoTL investigation. The article also considers the value of SoTL to individual faculty, their departments, and their institutions. It closes with additional resources and suggestions for pursuing SoTL in mathematics. (Contains 1 figure.)