I guess they expect you to know what it means. Granted the site isn't very good at explaining clearly what the product is. Just a lot of buzzwords here and there.
I personnaly prefer projects like Titanium(or React native), instead of using a webview and styled webpages(that will never feel native), it just uses javascript to call native phone apis,GUI included, so no HTML or CSS that looks like IOS on Android phones,but only native widgets.