Marlene. You put the card in your camera...then on the menu. clcik the little camera icon. It will say Format. You do this. All images will be deleted, but this is iomportant if you are switching cards between cameras.Think of it as refreshing... Now if they say cards are good for gazillion years...what happens when it gets full of deleted images. I'm sure at one point the deleted or scrambled images must build up. Same as how I think of a hard drive. Nothing is really gone. Just written into some tiny wee little code, that can only be retrieved with a a recovery system.

"The happiness of a man in this life does not consist in the absence but in the mastery of his passions."