I just discovered where STARs end and where a runway Approach plate begins is different. How would a pilot transfer from the end of the STAR to the beginning of the runway Approach plate? Do they get vectors?
No, the whole purpose of the STAR and SIDs is to reduce controller workload. Rather than be vectored and given altitudes for each point, the pilot will simply file for one of these predetermined procedures. The pilot will fly from fix to fix as the procedure is defined without specific instruction from the controller unless they’d like any deviations for traffic or weather.
These procedures allow the controller to avoid giving the same instructions 10000000 a day, expediting the movement of traffic in busy airspace.
EDIT: Misunderstood your question. They will be vectored at the end of the STAR for the approach, then the pilot will use the approach plate for their own reference. Typically following a SID the pilot will just proceed as filed unless alternate instructions are necessary.