How does Harry Potter Die, but not really?

Harry takes Snape's memories and views them in the pensive after Snape is killed by Voldemort / Nagini and learns that Dumbledore told Snape Harry he is the final accidental Horcrux of Voldemort. Harry must let Voldemort "kill" him in order to destroy the Horcrux. Thats what he does and after he is killed he goes to some sort of limbo where he chats with Dumbledore, who tells Harry its his choice to return to life or move on. Harry decides to come back. He feigns death and is aided by Narcissa Malfoy, who is eager to end the battle because Draco is trapped inside Hogwarts. Harry reveals himself to be alive when Voldemort tries to kill Neville by setting the burning sorting hat on his head.