A "Package" is simply the group of sites/www.pando.com/files/folders you've selected to send. If you are only sending one file, Pando will use the filename as the Package name, unless you tell it otherwise. But once you add more than one item to the Package, you'll need to name the Package. This is the filename your recipient will find attached to his or her email, the Package name Pando users see in their application, and the name of the folder saved to your recipients' computers.