Microsoft Edge DevTools is a set of web development tools built directly into the Microsoft Edge browser. It allows developers to inspect and debug web pages, providing features like an element inspector, console for JavaScript, and network monitoring. These tools help in optimizing website performance and ensuring compatibility across different devices. With Edge DevTools, users can also simulate various screen sizes and test responsive designs. The tools support real-time editing of HTML and CSS, making it easier to see changes instantly. Overall, Microsoft Edge DevTools is essential for developers looking to create high-quality web applications.