What is Next.js?

It seems to be on every front-end developer’s lips these days, but what exactly is Next.js?
It seems to be on every front-end developer’s lips these days, but what exactly is Next.js?
Rich web front-ends and headless CMS are the next big thing, but how do editors manage content for these kinds of solutions?
One pager apps, Next.js, React, Angular. How can rich web front-ends solve your pressing business problems?