About

A popover is a overlay graphic element

• that shows up (pops) over the actual graphic elements
• when the user makes an active action on an interactive/control element such as:
  • typing in a input box (search box)
  • or clicking a button
• that allows interaction with its content

It's associated to the interactive element and appears then near it.

An arrow generally points to the interactive/control element.

A tooltip is a sort of popover but it does not:

• requiert an active interaction (based on the mouse position)
• allow interaction with its content (the tooltip goes away when the mouse goes away)

Library

With javascript, the popper library helps you create popover.