What is "popover"

A Popover is like a tooltip, that is, a kind of guide with instructions, tips or information displayed after a certain action performed by the user, for example, when filling a form with invalid email, a tooltip/popover stating that the field must be filled in correctly so that the form can be sent. One of the only differences, if not the only one, between a popover and a tooltip, is that the popover may contain much more information within you.