What does an apostrophes of possesion mean?

An apostrophe of possession indicates ownership or association between nouns. It is typically placed before the "s" for singular nouns (e.g., "the cat's toy") and after the "s" for plural nouns that already end in "s" (e.g., "the dogs' park"). In cases of irregular plural nouns, the apostrophe is placed before the "s" (e.g., "the Children's Books"). This grammatical tool helps clarify relationships and belonging in sentences.