Google will roll out support for Instant Apps via an update to Google Play Services later this year, which means that they should work with most devices running Android 4.2 or later. When you encounter a link to a website that has an instant app, it’ll load on your phone as if it were a native app, but when you’re done you can close the app without having to uninstall it. This could especially come in handy for sites that you don’t visit that often, such as news sites or stores that you don’t read or shop at every day.
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http://liliputing.com/2016/05/android-instant-apps-load-like-web-pages-run-like-apps.html