An epic is a large, complex user story that is broken down into smaller, more manageable chunks called "user stories." Epics are often used in agile software development methodologies, such as Scrum, to describe the overall goal or theme of a product. They help product teams, including UX/UI designers, engineers, user experience researchers, and product managers, to understand the overall vision and direction of a product and to ensure that all team members are working towards the same goal.