What are the key differences between the agile theme and epic in project management methodologies?

In project management methodologies, the key differences between the agile theme and epic are that a theme is a broad goal or objective that guides the project, while an epic is a large and complex task that can be broken down into smaller, manageable pieces. Themes provide a high-level focus for the project, while epics help to organize and prioritize the work that needs to be done within that theme.