Ajax (Asynchronous JavaScript and XML) is a technique used to send and receive data asynchronously from a server, without reloading the web page. When testing a web application with Selenium WebDriver, you may need to handle Ajax calls in order to properly simulate user interactions and test the behavior of the application.  There are a few different ways you can handle Ajax calls in Selenium WebDriver, depending on your specific needs and the structure of your application. Here are a few options you can consider:  Wait for the element: One option is to use the WebDriverWait class to wait for a specific element to appear on the page before interacting with it. This can be useful if the element you want to interact with is being loaded as part of an Ajax call.  Use JavaScript: You can use JavaScript to make an Ajax call directly from your Selenium script. This can be useful if you need to test the behavior of the application when a specific Ajax call is made.  Use a library: There are also several libraries available that can help you handle Ajax calls in Selenium. For example, the AjaxElementLocatorFactory class in the SeleniumExtras library can be used to wait for elements that are loaded as part of an Ajax call.  Ultimately, the best approach for handling Ajax calls in Selenium will depend on the specific needs of your application and your testing goals.