Cross-browser testing is crucial for ensuring a uniform user experience across all browsers and devices. To select the most relevant browsers for compatibility testing, it's essential to consider factors such as browser popularity, device usage, and geographic location. According to Statcounter, Google Chrome is the most popular browser globally, with 64.77% market share, followed by Safari, Firefox, Samsung Internet, Opera, and UC Browser. When considering devices, mobile browsers like Chrome and Safari are leading, while desktop browsers like Chrome, Safari, and Firefox dominate the market. Geographically, user preferences vary across regions, with some areas preferring Safari or Firefox over others. To ensure a smooth user experience, it's crucial to prioritize testing on popular browsers and device combinations, using tools like LambdaTest that provide automation testing, geo-location testing, and other features to streamline cross-browser testing efforts.