In this chapter, we focus on research that is most pertinent to gifted education. We begin with an overview of the constructs (organized within the three original pillars of positive psychology) relevant to youth, education, and gifted education. First, we offer a working definition of giftedness and gifted education. [This paper was published in: S. I. Pfeiffer, E. Shaunessy-Dedrick, and M. Foley-Nicpon (Eds.), "APA Handbook of Giftedness and Talent" (pp. 433-449). Washington, DC: American Psychological Association. For the complete volume, see ED583676.]