Popovers are floating containers that opens on demand. They give users access to additional information and actions. The component is similar to Cards in that the content inside is highly customizable.
Popovers are general components with multiple purposes. For navigation or actions, use an Action Menu. For data input, use a Select.
Popovers have a set of fixed width options, ranging from extra small (192px) to a large (640px). This is similar in how the Modal's width operates. There is also an option for the popover to extend to 100% the width of the element it is wrapped around.