From Help Wiki
Apple Keynote is a versatile computer presentation program (think "digital slideshow"). It is most commonly used as an alternate to Microsoft Powerpoint. It is fairly easy to learn to use Keynote to make exciting media-rich presentations of your work. The program also has many ways to share your work, including as a Quicktime Movie or Powerpoint file.
Keynote, as part of iWork 09 is available in the Computer Center on the Macintosh computers. It is also available on lecture hall computers, so that you can project your presentation.