This video provides a comprehensive explanation of how browser User Agents work and their practical application scenarios. The author first uses the display difference between Flipkart's mobile and desktop versions to pose the core question: how do websites identify user devices and provide tailored content? Through animated demonstrations, the video then details the definition of a User Agent – a data set containing browser type, version number, and operating system information, transmitted to the server via HTTP request headers. The video deeply analyzes the complete process from user request initiation, browser carrying UA information, to the server's parsing and return of adapted content. Finally, it demonstrates how to view and parse your own User Agent string using online tools, transforming abstract concepts into actionable technical knowledge. This offers significant guidance for understanding responsive design, cross-platform development, and server-side device identification.
