what is responsive design?

An approach to creating web pages called responsive design uses flexible layouts, flexible images, and media queries in cascading style sheets. The objective of responsive design is to create web pages that recognise the size and orientation of the visitor's screen and adjust the layout accordingly.

In order to assure usability and satisfaction, responsive web design tries to make web pages render well on a variety of devices and window or screen sizes from the smallest to the largest display size.