A popconfirm is a small question shown beside an action to check that someone really wants to continue. It is like a quick “Are you sure?” before handing over something important.
For example, selecting “Delete” might show a small prompt with “Cancel” and “Delete” choices. This gives the person a chance to stop if they clicked by mistake.
Use it for a simple decision tied to one nearby action. Explain the result in plain words, especially when the action cannot easily be undone. A complex decision needs more room than a small bubble.