SlideShare is an online platform for sharing presentations, infographics, and other documents with a large online audience. Users need a LinkedIn, Facebook, or email account to log in to their SlideShare profile on the website, where they can upload files from various sources. They should provide information about the uploaded content like title, description, and tags to help others discover it. The profile allows users to track views, comments, likes, downloads, and other statistics of the materials they share on SlideShare.