User stories are simple, concise descriptions of a feature from the perspective of the end user. They typically follow a format that includes who the user is, what they want, and why they want it. This helps teams understand the user's needs and prioritize development efforts accordingly. In Agile development, user stories serve as a foundation for discussions and planning. They encourage collaboration among team members and stakeholders, ensuring that everyone has a clear understanding of the goals. By focusing on user needs, teams can create more effective and user-friendly products.