A tooltip allows a user to see hints when they hover over an item indicating the name or purpose of the item. Tooltips are meant to clarify or help the user with the content that they hover over, not add additional content.

Learn more

To learn more visit Bootstrap's Tooltip documentation.

Opt-in required

Per Bootstrap's implementation, the Tooltip data-api is opt-in for performance reasons. You must initialize it yourself.
$(function() {
    $('[data-toggle="tooltip"]').tooltip();
});