Answer to a question on Quora
Answer by Aniket Suryavanshi:
It's a simple landing page with some JS for the carousel at top, and for the smooth scroll effect on clicking the "What is Automatic" link. The layout is not fluid and not responsive.
This is a responsive landing page. A responsive page is fluid, and in addition uses extra browser capabilities like detecting browser width/height, detecting device type, detecting device orientation (landscape/portrait in case of mobile and tablet), number of colours supported by the device, etc. Responsive pages use media queries to conditionally style a page according to all these critera.