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. The user agent reveals browser, os, and device details. The weird looking string of text (above) is your user agent
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It's a short, technical description of the web browser, operating system, (and maybe mobile device) that you're using as you access the internet.
Usually, this string is used by the website owner to facilitate the end user experience, however, it can also be used to identify the user.
A user agent is a string that web browsers and other applications send to web servers to identify themselves This string typically includes information about the browser's name, version, operating system, and rendering engine. What is my user agent See your browser’s user agent instantly