Responsive Design website are special kind of websites that looks and work perfect on mobile and tablet devices also. There layouts change accordingly to the device on which the website has been open.
See our website, this is also responsive, it work accordingly to the device.
If you look at desktop size it will appear something like this: –
But when you look the site on tablet devices it re-size itself to the device size and all images also re-sized accordingly. See the tablet size preview here: –
Now if you open the site on mobile you will see that the menu get shrink accordingly and comes under tabbed icon and sidebar get down of the content area and footer and header also get adjusted accordingly. On touch screen devices you can see that you can slide the slideshow images by swapping through finger.