Popovers have the same type of content as modals but without interupting the user flow. These are therefore, a less drastic way of prompting the user for action. A close Icon is not needed here since users can dismiss the popover by clicking outside of it.
Like with tooltips, the pointer connects the tooltip with it’s parent element. Depending on the available space, the tooltip appears at the left, right, top or bottom of the parent.