Ever used Safari? Chrome? An iPhone? Android? Then you've used WebKit, the rendering engine that powers most of the best browsers in the world. Up next: WebKit2 with a new "split process model". it's going to be awesome. Subtly!
The banner feature for WebKit2 is the new split process model:
Part of WebKit operates in the UI process, where the application logic also lives. The rest of WebKit, along with WebCore and the JS engine, lives in the web process. The web process is isolated from the UI process.
If this sounds familiar, that's because Chrome did something similar a while ago, isolating different pieces of the browser - and specific tabs, even - in difference system processes, so that if one crashes, the rest are undisturbed. (And Mozilla is looking at something similar for Firefox right now.) The difference, though, is in how WebKit2's process splitting is implemented:
Process management [is part]of what is provided by WebKit itself, so that it is easy for any application to use.