The gist is it's some sort of distributed datastore network vaguely similar to IPFS [1], Freenet [2], but instead operates at a different level of abstraction from files. It ships with several other components, like an OS and a programming language, to flesh out that ecosystem.
But joking aside, about a month ago this well-articulated writeup was posted on their site: https://urbit.org/posts/overview/
There was an HN thread on it: https://news.ycombinator.com/item?id=11817721
The gist is it's some sort of distributed datastore network vaguely similar to IPFS [1], Freenet [2], but instead operates at a different level of abstraction from files. It ships with several other components, like an OS and a programming language, to flesh out that ecosystem.
[1] https://ipfs.io/#why [2] https://freenetproject.org/