One of the most appealing aspects of responsive web design is that a responsive website can provide a great user-experience across many devices and screen sizes. A site that works well on any resolution, on any browser, on any devices will provide a better and more consistent user-experience.
Easier to ManageHaving a separate desktop and mobile site requires having separate SEO campaigns, separate design effort and seperate management. with responsive website no need to keep different people for different devices, no need to keep different copies of website.
Increasing your reach to tablet and mobile audiences
Increase sales and conversion rates
Increase your visibility in search engines