A tautology is a statement that is true by its own definition. Therefore it is informationally redundant. An endless list could be created, but here is a small selection for you:

What will be, will be
All swans are either white, or not white.
A species that is more likely to survive, is more likely to survive.
This is a significant milestone (can there be an insignificant milestone?)
All MPs voted unanimously 'yes'.
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