How are "what" different from regular nuclear reactors? The question has insufficient information in it to be properly answered. Please restate the question.
Breeder reactors are built so that they produce more usable fuel than they use.The nuclear reactor is different from the breeder reactor because it generates energy through fission.
You are asking for a lot in one question! For thermal reactors there are replies available. Ask 'What are the advantages of nuclear fission power' and see the reply, there is also in the links...
They can produce more fissile fuel than they consume, from U238 or thorium. However the fuel cycle has to involve chemical treatment of the irradiated material, which is a costly process with...