In Google docs you can upload power point presentation as well as create them. You can share an online presentation with people by giving them rights to view the document. When giving a presentation, you might want to add some notes to specific slides in case you forget some points. In the speaker notes section, you can always jot down the points on which you need to emphasize more. You can do all this in Google docs by creating your speaker notes.
Follow this step by step Google Docs tutorial in order to learn how to play a presentation and add speaker notes to the slides in Google docs.