We use apostrophes in the English language for two main reasons:
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Possession: Apostrophes indicate that something belongs to someone or something. For example, in "the dog's leash," the apostrophe shows that the leash belongs to the dog.
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Contraction: Apostrophes are used to indicate omitted letters in contractions. For instance, in "don't" (do not) or "it's" (it is), the apostrophe replaces the missing letters.