On some platforms, you can add a short description to your app. There is not too much to say about it, as it is pretty much what you expect: a very brief corollary to your app's title.
This is currently supported on AmazonTV, Android, and Android TV and will show up below your app's title in the app store. This field has an 80-character limit, so keep it simple and to the point.
Overall Google guidelines
A short description should convey your app or game's message in 80 characters or less.
Give users a summary of your app's biggest benefits in your short description.
Don't repeat your short description in your full description.