Responsive Web Design makes your web page look good on all devices (desktops, tablets, and phones).
Responsive Web Design is about using HTML and CSS to resize, hide, shrink, enlarge, or move the content to make it look good on any screen
With responsive design you only have to build and manage one website. This is a strong advantage for businesses who update their content often. this is especially helpful for conversion optimization. In addition, your customers see the same brand experience regardless of whether they’re using a laptop, smartphone or tablet.