Google Presentations is an online presentation application, similar to Microsoft PowerPoint:
More than any other type of document, presentations are created to be shared. But assembling slide decks by emailing them around is as frustrating as it is time-consuming. The presentations feature of Google Docs helps you to easily organize, share, present, and collaborate on presentations, using only a web browser.
Presentations - whether imported from existing files or created using the slide editor - are listed alongside documents and spreadsheets in the Google Docs document list. They can be edited, shared, and published using the familiar Google Docs interface, with several collaborators working on a slide deck simultaneously, in real time. When it's time to present, participants can simply click a link to follow along as the presenter takes the audience through the slideshow. Participants are connected through Google Talk and can chat about the presentation as they're watching. The presentation feature is available in 25 languages.