user-agent

A user-agent is a software application that acts on behalf of a user when accessing a web page or other online resource. It typically identifies itself to the server with a unique string of characters that indicates which browser or other client it is using, as well as other details about the user's system and preferences. This information can be used by the server to provide a more customized experience for the user, such as serving up content that is optimized for their device or language. However, some user-agents may be used to scrape data from websites or engage in other types of automated or malicious activity, so website owners may use techniques such as IP blocking or CAPTCHA challenges to prevent abuse