How to inform user about new update availability?

I am new to unity. I have couple of developed apps at google play store. I have developed new versions of my few developed apps. I want to know is there a way to notify user of my app about new version?

As much details will be helpful. Thanks in advance.

When you upload a new APK via the Google Play Developer Console, it will automatically notify people to update via a notification, and by going to Google Play App > My apps and games. In fact, if the new version doesn’t require extra permissions, I believe the update will install automatically.