A Tooltip provides additional information for widgets when the user hovers over a widget. This information can consist in plain text, but also include an icon and complex HTML code.
A ToolTip can be attached to one ore more widgets be creating a ToolTip and calling the setToolTip() method with the ToolTip as argument on the widget. The ToolTip will be shown as soon as the mouse overs the widget. A ToolTip can be configured to contain an icon and label and to be shown/hidden after a certain amount of time.
Here are some links that demonstrate the usage of the widget: