Too Long; Didn't Read
Responsive web design is a design that adjusts and adapts to any viewport (user’s visible area of the web page) rather than only a specific viewport, irrespective of the visualization device. The viewport is a meta tag located in the <head> of the HTML and is defined as the visible part of a web page that a user can see from their device's screen. A responsive website has a better positioning in search engine results since for example, Google gives preference to those sites able to accommodate all screens.