Archiving a project bundles all of the project assets together, making it easy and convenient to store complete projects or move them to another computer. You may need to move a project to a computer that has a SuperDrive so you can burn a disc, or take it to someone else's Mac so she can work on the project. When you archive your project, it's saved as an iDVD project (.dvdproj) that can be opened later with iDVD.