SlideShare is a free Web-based sharing program that allows users to find, create and share presentations online. With SlideShare, anyone can upload slides to the Web from PowerPoint, OpenOffice, Keynote or a variety of other formats, including PDFs, videos and prerecorded webinars. You can easily sync MP3 audio files with your slides to create a musical slideshow or narrated lecture. Presentations can be kept private or made public if you would like to share your work with a wide audience. Viewers have the option to download public presentations and reuse or remix the slides. Another benefit of using SlideShare is that the presentation files can be viewed on smart devices without Flash and smart phones.