The tutorial on Selenium Grid 4 discusses its advancements over Selenium Grid 3, emphasizing its improved architecture for distributed testing. Selenium Grid 4, which introduces a fully distributed mode, allows for parallel test execution across various browsers and operating systems, thus enhancing the speed and efficiency of cross-browser testing. Unlike previous versions, Selenium 4 consolidates the Hub and Node into a single jar file, simplifying setup. It supports Docker integration, making it more adaptable for use with modern technologies and cloud infrastructures like AWS and Azure. The tutorial provides a detailed architectural overview and practical guidance on running tests using the new grid types, including Standalone, Classical Grid, and Fully Distributed modes. Despite being in its Alpha stage, Selenium 4 has generated significant excitement among developers and testers, due to its modern features and ability to seamlessly integrate with cloud-based platforms and technologies.