This document defines and discusses the concept of a generation gap. It notes that a generation gap refers to differences in opinions and values between generations, especially between youth and their parents/grandparents. The document then discusses what is typically considered a generation in terms of years (around 25 years), lists common generations (Traditionalist, Baby Boomer, Gen X, Gen Y, Millennial), and identifies some common causes of generation gaps including differences in lifestyles, communication issues, and lack of shared experiences between generations. It also discusses some effects of generation gaps and ways to help prevent them, such as parents spending more time with their children and trying to understand modern youth culture.