Possessive apostrophes are apostrophes (’) used with the letters at the end of a noun to show ownership over or a close connection with another noun. For example, if you were talking about the tail of your cat, you can add a possessive apostrophe and an s to show which noun is the owner.
My local cafe had one they adopted from the street (or she adopted the whole cafe). She would choose random people to jump on their laps and demand pets. Even though I'm a dog a person I miss her. Not because she passed away but because I moved away. I'm guessing she is still extorting pets.