Since version 1.0 of the ArcGIS API for JavaScript, a user’s first interaction when clicking a map has usually been to get a popup. The Popup 1 widget is typically the first entry point to the raw data behind the visualizations displayed on the map. A well-defined visualization of data on a map may tell you the population density of a city compared to an adjacent city based on a color from a color ramp or the size of the point displayed. But your first look at those raw numbers is probably going to come from clicking that feature and viewing the data in the popup.
Because popups ...
