Slideshare is a website launched in 2006 that allows users to upload presentations in various formats and share them with others online. It has over 60 million visitors and 130 million page views per month, making it one of the top 200 most visited sites. Users can create and upload presentations from other apps, add tags and descriptions, and then share or present them on Slideshare. This provides accessibility, compatibility, sharing capabilities without additional downloads or loss of picture quality compared to other options. However, Slideshare can sometimes be slow and animated elements or sound effects may not transfer properly when converting files to Flash online.