This document discusses the presentation tool SlideShare. SlideShare allows users to upload and share PowerPoint presentations, Word documents, PDFs, audio and video publicly or privately. It is useful for teaching as it saves teachers time in preparing lessons and presentations. Teachers can present information visually in a way that is less dense for students to understand. SlideShare provides benefits to both teachers and students, making it one of the most used educational tools. The document emphasizes that using web 2.0 tools like SlideShare allows sharing and accessing information from anywhere and archiving presentations on websites or blogs.