Описание тега infowindow

The InfoWindow is a standard class within the Google Maps JavaScript API; it is an overlay that displays content in a floating window above the map and is anchored at a specified location on the map.

The InfoWindow is a standard class within the Google Maps JavaScript API; it is an overlay that displays content in a floating window above the map. An info window looks like a comic-book word balloon; it has a content area, a tapered stem, and the tip of the stem is anchored at a specified location on the map.

Questions that are assigned to this tag should deal directly with InfoWindow creation, placing content within an InfoWindow, styling the content within an InfoWindow, displaying or hiding InfoWindows, or managing InfoWindows on a Google Map.

Google has published some very good material for those that want to learn more about InfoWindows: