AutoIt is a scripting language that is often used in combination with Selenium for automating certain types of tasks that are not possible to perform using Selenium alone.  One common use case for AutoIt with Selenium is automating the handling of dialogs and pop-ups that are not directly accessible through the browser's DOM (Document Object Model). Examples of these types of dialogs include file upload dialogs, authentication dialogs, and alerts.  Another use case for AutoIt with Selenium is automating tasks that involve interacting with the operating system or desktop environment. For example, you might use AutoIt to automate the creation of a new file on the desktop or to send keystrokes to a specific window.  Overall, AutoIt can be a useful tool to have in your automation toolkit when you need to perform tasks that are not possible with Selenium alone. However, it is important to note that AutoIt is a separate tool and requires additional installation and setup.