I remember a few years ago Collada was quite the popular 3D file format. What are the latest trends in that field now?
STL is for manufacturing. STL has long been popular for commercial FDMs and CNC machines, and it is also what hobbyists use for their FDMs ("3D printers").
Finally people are moving forward from the twenty-year-old OBJ and the horrorshow that is FBX...