What is responsive web design?
Responsive web design Is a style of coding that allows websites to respond to the all devices it’s being viewed on. For example if it’s a smartphone, computer or any other web surfing devices, it makes the website’s user experience better.

How does it work?
Responsive design allows specific codes to be called based on a user’s web browser width. The code is written in a way to distributed content in percentages of the screen sizes.

What are the benefits?
It looks good on smartphones, tablets, computers & other devices. It’s user friendly and SEO friendly(Google recommends it).

Want to learn more? check out these links…
http://alistapart.com/article/responsive-web-design

45 Free Responsive WordPress Themes…
http://www.hongkiat.com/blog/free-responsive-wordpress-themes/