A "nudge" is a concept in behavioral economics that refers to subtle changes in the way choices are presented to influence people's decisions. It aims to encourage individuals to make better choices without restricting their options. For example, placing healthier food options at eye level in a cafeteria can lead to better dietary choices. Nudges are based on the idea that human behavior is often influenced by cognitive biases and social norms. By understanding these influences, policymakers and organizations can design environments that promote positive behaviors, such as saving for retirement or reducing energy consumption, without imposing mandates or penalties.