Have you ever written a letter and then remembered something important after you signed your name? That's when you add a postscript! A postscript, often written as P.S., is extra information tacked on at the end of a letter, story, or book. It comes after the main part and the signature.
People add P.S. notes quickly, like when you forget to say "I love you" or mention a fun fact. For example, "P.S. Don't forget the cookies!" It's a simple way to share one more thought without rewriting everything.
Postscripts make letters feel personal and exciting, like a surprise bonus.