A browser's user agent string (UA) helps identify which browser is being used, what version, and on which operating system. When feature detection APIs are not available, use the UA to customize behavior or content to specific browser versions.
Useragent is a small piece of data that is sent by your web browser when accessing a website or application. It is used to identify the type of browser you are using, what device and operating system you are using, and the version of the browser you are using. This information is important for websites and applications to ensure optimal performance and compatibility. It also allows developers to customize their websites and applications based on user agent data.