What is difference between openlayers & openstreetmaps ? is openlayers made on openstreetmap or vice versa ?
As the GIS SE tag descriptions note:
OpenStreetMap (OSM) is data
OpenStreetMap is a collaborative project to create a free editable map of the world. The data is free, and free of legal and technical restrictions. OpenStreetMap is often shorted to OSM.
OpenLayers is a client viewer