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

reliable communication

    Communication where messages are guaranteed
   to reach their destination complete and uncorrupted and in the
   order they were sent.  This reliability can be built on top of
   an unreliable protocol by adding sequencing information and
   some kind of checksum or cyclic redundancy check to each
   message or packet.  If the communication fails, the sender
   will be notified.  Transmission Control Protocol is a
   reliable protocol used on Ethernet.

   (2004-09-14)