Getting started with responsive-design – What is responsive web design?

The term responsive web design was first coined by Ethan Marcotte in his famous article Responsive Web Design, published in 2010 in A List Apart.

This Smashing Magazine article by Kayla Knight describes it as follows:

Responsive Web design is the approach that suggests that 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 an intelligent use
of CSS media queries. As the user switches from their laptop to iPad,
the website should automatically switch to accommodate for resolution,
image size and scripting abilities. In other words, the website should
have the technology to automatically respond to the user’s
preferences. This would eliminate the need for a different design and
development phase for each new gadget on the market.

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Getting started with responsive-design – What is responsive web design? - CodeDay