Exporting to QuickTime or for use with iDVD
http://www.design.iastate.edu/LABS/tutorials/imovie/imov0007.html

Iowa State University
2003

Abstract:

You have this great project that you've just finished, and you need to bring it into another program, display it on your web site, or turn it in on CD or DVD. To do this, you will need to export your movie. iMovie has several 'built-in' configurations that take much of the guesswork out of compressing your video for optimal playback on one of those media types. I often find, however, that the standard choices are not quite what I want or need. This is when the Expert options come into play.