The importance of cross-browser testing cannot be overstated in ensuring that software development teams provide their customers with flawless user experiences through cross-browser compatibility. Selenium is a well-known framework for automated cross-browser testing, allowing developers to test web apps across different operating systems and browser configurations. By automating web app tests using Selenium, developers can ensure consistency in usability, regardless of the OS or browser version, thereby improving the consumer experience. Cross-browser testing also helps identify browser-specific issues earlier, saving time and money. While manual cross-browser testing is possible, automated testing with Selenium is faster and more practical due to test scripts being created and run automatically. To get started with cross-browser testing using Selenium, developers can write a Python test script, install the necessary dependencies, and then use Sauce Labs as a cloud-based platform for running tests on various browsers. This approach enables more automation, greater test coverage, and overall application efficiency.