SlideShare is a hosting service for professional content like presentations, infographics, documents and videos. Users can upload files privately or publicly in formats like PowerPoint, Word, PDF or OpenDocument. Content can then be viewed on the site, mobile devices or embedded elsewhere. Launched in 2006, it allows sharing of slideshow files up to 20MB with descriptions and tags for searching, commenting and embedding. The tool is important for teaching as it allows teachers to convey messages to students through slides easily viewed online, helping achieve learning objectives and satisfactory results.