The similarity and difference between re-buy tournament and re-entry tournament

As we all know, re-buy tournament and re-entry tournament are two kinds of poker tournaments, and the two poker tournaments are very similar, but have a little difference. The one common rule of between re-buy tournament and re-entry tournament is that the players in the two tournaments all have the fixed chips at beginning, Otherwise, In re-buy tournaments, even if you have losing all of your chips, you also can buy another more chips, and continue to play. The re-entry tournament also has the chance to play when you run out of your chips, but the number of times you can re-entry in a re-entry tournament is limited, once you run out of the allowed times of re-entries, you will not be allowed to play again in that poker tournament. While the re-buy tournament has no limit, you can play all the time only you have enough money. And you can accord your actually condition to choose what kind of tournament to play.