In the book the giver what does Jonas learn about what happens during a Release?

In the book, The Giver shows Jonas what "Release" really means. So Jonas learns "Release" means death. For instance, they place you into a special room and give you an injection to kill you. That's what they do to the Elderly when they have lived long enough, and they "Release" them. Sad though, those who aren't quite happy with their community, can just simply apply for "Release."