The Elders choose Jonas to be the Receiver of Memories. He will receive memories from the past which will change his whole life forever.
Jonas first meets the Giver and talks about how important it must be to have someone to have the memories of the past to provide information to the Elders.
The Giver gives Jonas one of his memories of the past and how the weather could be like since now there is climate control. Jonas than begins to realize how great the past was before their perfect community.
With the memories he was given he was trying to expose the community what the Elders were hiding. His friends become more distant because he was acting different ever since he was chosen to become the Receiver of Memory.
Runs away from the community with Gabe who was about to be released which means killed because he was a twin. He gets passed a limit which holds the memories away. Once he passes the limit, the memories which once were the past is now the present.
Once Jonas and Gabe passed the limit of the shield of memories have been broken. Everyone in the community got the memories of the past which is now the present. Now there is love, real love, not love where you get selected to be with a partner. The memories show what use to be their world before the community was built.