Slide show "is an on-screen presentation of information / ideas presented on slides. A slide show enforces the ideas, comments, solution or suggestions presented in the slide”(WikiPedia, 2012). Slide show presentation helps to share the ideas with others and get the feedback from them.
VoiceThread is Web-based collaboration toll that allows users to create a shared presentation as a media album that visitors can asynchronously comment on either by text, voice, or video.
Reference: Wiki Pedia, accessed on 15-June-2012 http://en.wikipedia.org/wiki/Slideshow