


By default, when you launch iPhoto, it loads whichever library file you had opened the last time you used iPhoto. You can have as many Photo Library files as you wish. The iPhoto application loads your Photo Library file after the application itself loads. This contains all of your master images, preview and thumbnail versions of your images, and all of the database files that the iPhoto application reads and writes to to know all of the information about each one of your images and how you have them organized.

Photo Library File - a self-contained folder that looks like a single file in the Finder application. IPhoto Application - the program developed by Apple that does the magic. There are 2 things required to make your photo collection load in iPhoto.
