The Atlas Interface is an object in space along the Atlas Path that offers three things to passing travelers. You can acquire more knowledge of the local language by walking over the glowing orbs scattered around the area, you collect blueprints as you travel along the bridge towards the Atlas Interface, and the Interface gives you an Atlas Stone. To upgrade your standing with the Atlas, raise your overall milestone counter. The Atlas is only invested in the overall data you have collected.
Bellow is a video of a traveler visiting one.