is
If this entity should not take damage from any source.
When this is true, the following statements are also true:
If this entity is living, it cannot be moved by fishing rods, attacks, explosions, or projectiles.
Objects such as vehicles and item frames cannot be destroyed unless their support is also removed.
If this entity is a player, it will also be ignored by any hostile mobs.
Setting this to true, however, will not prevent this entity from being damaged by a player in creative mode.