What causes freezer burn?
How can I tell if meat has freezer burn?
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See [this question](http://cooking.stackexchange.com/q/16769/5505) for an example of freezer burn. – Caleb Feb 20 '12 at 01:23
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Freezer burn is just the food being dehydrated. Most meat will change color, and it becomes very obvious if you defrost it. It's not unsafe: just yucky.
Marc
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If it's just dehydrating it, why can't you just add water back in (eg. cook/soak it in liquid)? – Double AA Dec 09 '15 at 16:07
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@DoubleAA no you can't. The surface gets dehidrated, its texture changes in an irreversible way. – Luciano Sep 24 '18 at 10:53
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Leaving foods unwrapped or directly exposed to the air in your freezer/refridgerator will contribute greatly to freezer burn - try to put leftovers in containers or wrap them to ward against freezer burn :)
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