Mapbox is a layer of map which uses data from OpenStreetMap to make the map more customizable for websites and your needs.
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Pro Uses data from OpenStreetMap
The maps uses data from OpenStreetMap which is community friendly map because anyone can contribute to the maps through main OpenStreetMap website or third party OSM editor and changes will be immediately appear.
Pro Highly customizable maps
The maps can be customizable not only by the provided templates, but users can also tweaks the map style based on how it should be look such as color, aerial view, size etc.