The document discusses SlideSpeech, a tool that allows users to add script to presentation slides, save the slide images, and use text-to-speech to generate a video presenting the script and slides. SlideSpeech works by taking a script added to slides, saving the slide images, and using those images and text-to-speech to generate a video. The document provides examples of using SlideSpeech to directly share knowledge through video presentations in multiple languages.