A report on wikimedia for the first information read the (automatic translation)
maps.google is a map, BingMaps is a map OpenStreetMap is not a map … “OpenStreetMap is a huge database, allows everybody to create maps according to his needs. OSM is made by people like you and free to use under an open license.”
If you want to compare the quality - Left: GoogleMaps, Right: OpenStreetMap - Please note: the map(s) are zoomable! :)
as examples database queries or in other words: “homemade maps”.
Note: The above maps are created live when you call them up, this means that if a new school is added, it is immediately included in this map ;-)
Note: There is not only the standard map, but many special maps - that’s possible, because OSM is a DB. ;-) https://wiki.openstreetmap.org/wiki/List_of_OSM-based_services#General
… and individualized private maps …
Who does the quality control? - The Community! - OpenStreetMap is the Wikipedia of maps!
All about the topic: Quality Assurance
some Universities with a strong OMS commitment
… and also for
* Garmin always current routable maps …
… and humanitarian projects HOT and Missing Maps working with MSF and the International Red Cross
… and, and, and