Google Play services for Instant Apps

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Google Play services for Instant Apps is the underlying framework for the Instant Apps feature provided by Google. Read more about Google Play services for Instant Apps  

In case you didn't already know this, Instant Apps allows users to test an application without having to download it. This is done by letting people access a "cloud" version of the application.
The ability to access Instant Apps is especially useful if people want to test something before buying it, which makes a lot of sense. It's also important to know that not all of the apps in the official Google Play Store have support for this particular feature.
Of course, there is a special component in Google Play Services for Instant Apps and needs to be upgraded along with everything else.