SlideShare is a free website that allows users to create and share slideshow presentations. It can be used by teachers to share ideas and lesson plans with each other. Students can also use SlideShare to put up presentations on topics they have researched and read about in order to demonstrate their understanding to the class. While it does not support video or collaboration, SlideShare is a useful tool for both teachers and students to communicate information through slideshow format and explore presentations uploaded by others.