Progressive enhancement is a strategy for responsive web design that emphasizes accessibility relational to the user’s device. The aim is to allow everyone access to basic content and functionality of a website, starting with the smallest of devices (eg, your smartphone) and then gradually enhancing the experience as you move up to larger devices that have more advanced browser software, greater bandwidth and more powerful processing.
From a philosophical perspective, progressive enhancement is vastly superior to graceful degradation. As opposed to punishing us for using less capable devices and older browsers the strategy rewards us as we progress through each platform. Progressive enhancement comes from a happy place. It’s a Zen thing.
Developing responsive websites with progressive enhancement should be a best practices standard for web design agencies. Sadly, most of them still cling to the old graceful degradation legacy approach, because that is what they know. If you own or manage a website in 2013 you should be very concerned with content availability, overall accessibility and mobile browser compatibility. I strongly recommend that you take the time to learn more about progressive enhancement and responsive web design as they relate to your overall web strategy.