SlideShare is a social media site that allows users to upload and share presentations. Users can create presentations using tools like PowerPoint and upload them to SlideShare to gain an audience of millions of viewers. The process involves creating an account, uploading a presentation file, adding metadata like title and tags, and publishing it. Presentations can be discovered across many categories. Some advantages of using SlideShare include building an audience, saving presentations offline, and potentially earning money. However, it is not fully mobile friendly and only allows uploading, not editing, of presentations. Special sites on SlideShare recommend using an attractive title, short descriptive text, simple structure, visual elements, and promoting uploads on other social media.