Google Play Protect is a security feature provided by Google for Android devices that detects and scans for malware.
When a user installs an application from the Google Store or outside the store, the protection service automatically performs feature detection and matches the malware database.
If the malware database is successfully matched, the user will be directly blocked from installing. If the user has already installed, Google will also issue a reminder when the database update matches.
From 2017 to 2018, Google Play Protect blocked 3.2 billion malware installations. Of course, both malware and unwanted software were blocked.
Under normal circumstances, Google will not block if it is not malicious or harmful behaviors. For example, some software constantly pops ads to interfere with users but is not harmful.
The latest data released by Google is that the malware was blocked more than 1.9 billion times in the whole year of 2019. Obviously, this number has increased significantly from 2017 to 2018. Google Play Protect scans over 100 billion apps for malware every day.
Google believes that the probability of users being infected by installing software only through the Google Store is very low, and automatic scanning with protection services can quickly resolve various types of malware.
At the same time, Google is also tightening the developer policy of the Google Play Store to prevent unscrupulous developers to directly submitting unsafe software.