Android comes along with a native application that takes on the role of webpage viewer. The latter is present on all devices running this operating system but doesn't always behave the same. On Android devices prior to version 5.0, it's always running and operative, whilst on devices with Lollipop or later, it's disabled when Chrome has been installed and enabled.
The security barrier between Android and the web
The fact is that Android System WebView is the most prone app to receive attacks from malicious webs and could be considered as a firewall for our smartphone. Google updates it through Google Play on a regular basis to correct security errors as soon as possible and on as many devices as possible. However, from Android 5.0 and after, although present on our system, this app is disabled because Chrome takes care of all its functions.
If your phone does use it because you don't use Chrome or because it's prior to Android 5.0, you should never reject the update requests if you don't want to jeopardize your security.
What's new in the latest version
- Changes to improve the performance and fix bugs.