What are those bandages that people put on their puppies' ears?

I've seen a lot of people online who have purebred/show puppies (especially breeds like German Shepherds, Boxers, and Australian Shepherds) and have different bandages on their puppy's ears at certain ages.
What are they for?
I mean, I've Boxers/Dobermans/etc. with bandages. They must have been cropped.
I've German Shepherd puppies with sort of braces on their ears. Is this to make sure the puppy's ears grow upright?
And I've seen Australian Shepherds with little things on the tips of their ears. Is this to make sure the tips stay drooped down?
 
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