Browser compatibility refers to a website or app's ability to perform optimally across different browsers and devices. Synonyms for this term include cross-browser compatibility, multi-browser compatibility, and platform compatibility. Other related terms are responsiveness and mobile responsiveness, which refer specifically to a website's adaptability to different screen sizes and resolutions. Accessibility is yet another synonym that can be used to convey the idea of a website being easily accessible on different devices, browsers, and operating systems. Ultimately, ensuring that a website is compatible with different browsers and devices is crucial to enhancing user experience and increasing engagement with the site or app.