The responsive web design term is related to the concept of developing a website design in a manner that changes the lay out according to the user's computer screen resolution. More precisely, a design can allows for an advanced four column layout at 2000 pixels wide layout. However when shown on a 1025 pixel width screen, it changes into 3 columns layout. Then, it suitably changes again for the smartphone and computer tablet screen.
This designing technique is call "responsive design" and is now a Google requirement. It's the most important change you can make to your digital marketing strategy. One marketing message presented to all technology devices.