Popover vs. Tooltip

A tooltip appears on hover, holds only a short text label, and vanishes the moment the pointer leaves — you can never click inside it. A popover opens on click, can hold real controls (forms, buttons, lists), and stays open until you dismiss it. If you can interact with its content, it's a popover.

How to tell them apart

It opened without a click, just from resting the pointer on something → tooltip.
There's a button, input, or link inside it → popover.
It stays open when you move the mouse away → popover; a tooltip dies with the hover.
On a phone it can't be a tooltip — there is no hover. The tap-opened bubble is a popover.