SlideShare is an online platform for sharing presentations. The document discusses how to use SlideShare by uploading presentations, designing them effectively, using keywords to increase discoverability, and sharing presentations on other platforms like LinkedIn to drive more traffic. Uploading a presentation involves selecting the file from your computer or cloud storage, adding a title, description, tags, and publishing it on SlideShare. Well-designed presentations with valuable content and optimized keywords will perform better on SlideShare.