Browser compatibility refers to the ability of a website or web application to be correctly displayed and functioned on different web browsers. This means that the website or application should look and perform the same on all popular web browsers such as Google Chrome, Mozilla Firefox, Internet Explorer, Safari, etc.
Different web browsers have their own rendering engines, standards and capabilities, which can cause the same website to display or behave differently. Ensuring browser compatibility is an important aspect of web development as it ensures that users have a consistent experience regardless of the browser they are using.