Agenda setting is a communication theory that explains how media influences the public's perception of what issues are important. By choosing which stories to highlight, the media can shape the topics that people discuss and think about. For example, if news outlets focus on climate change, it becomes a priority for the public and policymakers alike. This process occurs through two main levels: the first level sets the agenda by determining which issues are covered, while the second level influences how those issues are perceived. For instance, if political leaders emphasize economic inequality, it can lead to increased public concern and action regarding that issue.