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Use the apostrophe to indicate possession and to mark omitted letters in contractions. Writers often misuse apostrophes when forming plurals and possessives. The basic rule is quite simple: use the apostrophe to indicate possession, not a plural. Yes, the exceptions to the rule may seem confusing: hers has no apostrophe, and it's is not possessive. Nevertheless, with a small amount of attention, you can learn the rules and the exceptions of apostrophe use.
SOURCE: Nesbitt-Johnston Writing Center