Just finished watching a video on Android Instant Apps which Google is currently experimenting. Instant apps just launch by tapping the link without the need for the full app to be installed. e.g. if you have been sent a link for a recipe you can instantly access the video of the recipe without the need for installing the app.
The other cool thing is once you close the instant app, it just lives in the cache only for a few hours and the app is gone and you need to click the link again if you need to access it. Basically it allows to reclaim the space once you finish with what you wanted to do with the Instant App.
Also if you need to retain the app then Instant App allows you to download the app using the Install button from the top right corner of the Instant App.
This is really cool as you can direct your users straight to the required link of the app.
You can upgrade your existing Android apps to Instant App. It works on Android Jelly Bean devices and up.
Currently the SDK is open for early adopters so watch this space.