What is Responsive Web Design..?

Hello friends,

I would like to know that What is Responsive Web Design..?

Responsive Web design is the approach that suggests design and development should respond to the user's behavior and environment based on screen size, platform, and orientation. The practice consists of a mix of flexible grids and layouts, images and intelligent use of CSS media queries.

Responsive web design is an approach to web design that makes web pages render well on a variety of devices and window or screen sizes. Recent work also considers the viewer proximity as part of the viewing context as an extension for RWD.