This document introduces the concept of nudging, which refers to subtly changing people's choices in order to influence their behavior. It discusses why nudging is needed to address problems like obesity and the "tyranny of choice." The EAST model is presented as a framework for effective nudging, focusing on making options easy, attractive, social, and timely. Finally, the document outlines four types of nudges - mindful, mindless, encouraging, and discouraging - and provides examples of each.