This document provides an introduction and overview of public policy as an academic field. It discusses how public policy emerged in the 1950s and is now an interdisciplinary field that draws from many social sciences. The document defines some key concepts related to public policy, including the idea of "public" versus private, and different definitions and understandings of the term "policy." It also discusses how studies of public policy have traditionally been led by political science and public administration but now incorporate many disciplines.