One of the most important benefits responsive web design is that great user experience across many screen sizes and devices is assured. That is an important feature since it is practically impossible to anticipate or establish all the screen sizes and devices searchers will use to access a website
. A site working and functioning well regardless of the variables will give the user with a more consistent and better user experience than a separate mobile site that has been specifically designed for a certain device.
For example, if a person searches for a product online, they have a site that provides that product. When they get home they will continue the search, only this time they will use a computer instead of a smartphone. A responsive site will provide this person with a positive user experience during the transition from smartphone to desktop.