What is a super computer

That is pc that is mostly use by NASA and other high tech companyis it is definitivly not like normal computer.He is leading the all company machines.all electric(robot)devices.When NASA launch a space shuttle in space on mission super computer do all job it is like tracking device then it shows air compress...and stuff or air companyes have super computers...when airplanes start flying and when pilot turns autopilot what do you mean how is it keeping its line it is in super computer and when airplane start to go down of his line super computer automaticly upping airplane till he doesnt reach his line...