Today, a website must not look good only on a desktop screen, but also on tablets and smartphones. A website is responsive if it is able to adapt to the screen of the client. Fortunately Designing Your Own Responsive Website was Never That Easy.
Responsive web design (RWD) is an approach to web design that makes web pages to look well on a variety of devices and window or screen sizes. The practice consists of a mix of flexible grids and layouts, images and an intelligent use of CSS media queries.