That means you have an app waiting for you to update. The only way to get rid of that red badge on the App Store icon is to update the app that's ready for the update.On my iPhone 6s the App Store has a red circle with the number 1.
What does that mean in this case and how do I get rid of it?
If you open the App Store and tap the Updates button at the bottom of the page, the list of all apps awaiting updates will appear. If you want to update all of them, tap the Update All button at the top of the page.Thanks.
And how do I know which app it is?