Some creatures are utterly fearless, and will never give up a battle, no matter how hopeless the situation. This is occasionally due to bravery, but more commonly because the troops in question are mindless, insane or magically controlled.
Source: Warhammer Fantasy: 8th Edition
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A unit composed entirely of Unbreakable models is Immune to Psychology and passes Break tests automatically, no matter the odds!
Characters that are not themselves Unbreakable are not permitted to join units that are (even if a character was to become temporarily Unbreakable for some reason, because of a spell or suchlike).