Selenium 4, the latest version of Selenium, is now W3C compliant, offering numerous benefits such as consistency and stability across different browsers, reduced flakiness in web automation, and improved performance. The introduction of WebDriver W3C protocol replaces the older JSON Wire protocol, providing a more standardized and efficient way for communication between the WebDriver and browser. This change allows developers to use Selenium 4 without compatibility issues, making it easier to test and deploy applications across different browsers and platforms. With the support of modern web browsers like Chrome, Firefox, Safari, and Internet Explorer, Selenium users can expect less flaky, more consistent, and more stable automation testing with WebDriver W3C protocol in Selenium 4.