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Responsive web design is a design technique that allows your website to be fluid and adapt to a number of devices, including desktops, laptops, smartphones and tablets. 

The coding resizes, hides, shrinks, enlarges or moves the content to make it look good on any screen.

By Stéphanie Walter -, CC BY-SA 3.0, Link

A responsive website is mobile friendly, so it saves you money as only one site is needed