Puppeteer is a Node library that provides a high-level API to control headless Chrome or Chromium, allowing developers to automate their interactions with a browser-like environment via a command-line interface. It can be used to generate dynamic images for social media sharing by taking screenshots of web pages and providing a link to a serverless function that generates the image. This approach can also be used in build pipeline tools, front-end applications, or as a way to provide richer experiences for users. The library can be installed using npm and can be used to create custom serverless functions, command-line interfaces, or front-end applications.