The Free On-line Dictionary of Computing (30 December 2018):

plug and play

    1. Hardware or software that, after being installed
   ("plugged in"), can immediately be used ("played with"), as
   opposed to hardware or software which requires configuration.

   See also turnkey, plug and pray.

   2. A new recruit who needs no training.  "The new guy, John,
   is great.  He's totally plug-and-play."

   (1997-03-30)