When adopting agile and DevOps, an epic serves to manage tasks. It’s a defined body of work that is segmented into specific tasks (called stories, or user stories) Epics help teams break their work down, while continuing to work towards a bigger goal. Epics often encompass multiple teams, on multiple projects, and can even be tracked on multiple boards. Learning how epics relate to healthy DevOps best practices is an essential skill no matter the size of your organization.”]
Source: https://www.atlassian.com/agile/project-management/epics