Google Instant App.
Last year Google at their Google I/O launched a new feature in the play store called as Instant Apps.
The interesting fact is these are small parts of the apps, they are running on google server and gives you the same experience as the original one without installing it on your device. It can be useful in many places where you need the app for the one-time purpose.
Though this was launched last year Google has started rolling out only very few little apps which can support it in specific parts and versions.
How to enable instant app?