What is a "native web app"? I've come across the term "native web app" also known as "hybrid app".
I know what "web apps" and "native apps" are, the difference being that
the former are downloaded and run within a web browser and the latter
are code (not html) and run a little faster without requiring a web
browser to interpret them. So what is a "native web app", how can
a web app be native?
Unlike native apps, web apps can't access low level API of system (to access hardware etc) unless it is supported by web standards (most aren't supported to maintain web app portability). Here, native web apps comes to rescue.

In Native Web Apps, web codes (HTML, CSS &amp; JS) run in a native wrapper code. The wrapper code is native (can use low level API) which contains webview to render the web app. So, it taps the benefits from both worlds (that's why its called Hybrid App).

For example, Facebook app (in Play Store) is a native web app. When you see your timeline, friends' profiles etc in this app, you actually see webpages. But, at the same time, this app can access your camera, Android's system-wide share menu etc.
Another great example is Google Currents.