Puppeteer is a Node.js library that provides a high-level API for controlling headless Chrome or Chromium browsers. It allows developers to automate web tasks such as testing, scraping, and generating screenshots or PDFs of web pages. Puppeteer is particularly useful for tasks that require interaction with web elements, as it can simulate user actions like clicking buttons and filling out forms. With Puppeteer, users can easily navigate web pages, extract data, and manipulate the Document Object Model (DOM). It is widely used in web development and testing environments, making it a valuable tool for developers looking to streamline their workflows and improve efficiency.