Here is the description of the Popups Namespace:
Contains classes that allow the display the data of a feature, graphic or pixel (geo elements) in a way that is easier to understand than basic attributes in a row/column format via a 'popup' graphical element that floats on top of the map. Popups are part of the ArcGIS information model and can be configured for individual layers (or sublayers) in a map via a popup definition. They can also be used with graphics and graphics overlays, and pixels and rasters. Popups convert raw data into an information display that is both powerful and easy to read. Some common uses of popups are: display results from an identify (aka. a user map view click) and editing a feature by adding/updating/deleting attributes/geometry.