Responsive design means that the website is programmed so that the same code is displayed to the user regardless of the device they're using: a desktop computer, a laptop, a tablet, or one of the many smartphone brands. The website content and layout "responds" to the width of the device's screen and and re-organizes the images and content so that they fit attractively on that device. So responsive design means that the site layout "responds" to the screen dimensions on the user's device.
Responsive websites have become the "gold-standard" for business websites and offer many advantages