Polaroid Guest Book

i saw someone ask where you get the film for the poloraoid guest book --- which makes me wonder

what is a polaroid guest book?

its a guest book where a picture is taken of the people signing (Mr and Mrs Smith)...
then next to it, Mr and Mrs Smith leave a persaonl message... This is a different way to capture your guest at the wedding and allowing you to remember Aunt Judy on your dads side that you havnt saw since you were 11 years old