What is the difference between apostrophe and quotation marks?

Apostrophes are used primarily to indicate possession (e.g., "the dog's leash") or to form contractions (e.g., "it's" for "it is"). Quotation marks, on the other hand, are used to denote direct speech, quotations, or to highlight specific Words or phrases (e.g., "She said, 'Hello'"). While both are punctuation marks, they serve distinct grammatical purposes.