http://www.techradar.com/news/windows-10-will-soon-get-progressive-web-apps-to-boost-the-microsoft-store

Microsoft is bringing Progressive Web Apps (PWAs) to the Microsoft Store and Windows 10 with the next major update of the operating system due to land in the spring.

At this point, some of you may be asking: 'progressive what now?' If you’ve not heard of PWAs before, they are simply websites (or web apps) which are implemented as native apps, and delivered just like a normal app through Windows 10’s store.