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The term Responsive Web Design means "responsive web design" in a figurative sense. Content and navigation elements as well as the structural design of a website adapt to the screen resolution of the mobile device. In order for your new website to make a good impression on all end devices, it must be adapted to the screen resolution of the different end device classes (desktop, tablet, mobile). This is done in RWD by means of media queries, so-called CSS media queries.
To ensure that a high-performance website is created during implementation, I use the tried-and-tested mobile-first principle, in which the website is first programmed for mobile devices and the layout is then adapted for larger devices. You can find more information on the page "Responsive Design in Web Design & Conception".