performance - How does Google Maps work? - Stack Overflow
The technology could generically be described as a map server. The map server generates a map for the requested location from a large set of pre-generated map tile images covering the entire planet. The map server may overlay data from other databases on top of this. The combination of a map viewer client and geographical database is traditionally called a Geographical Information System (GIS).
Anyone can write web applications that embed Google maps using the Google Maps API.There is also a fine open source map server (called MapServer) should you wish to deploy your own map server.
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