ASO (App Store Optimization) is the process of improving an app's visibility and ranking within app stores like the Google Play Store and Apple App Store. Its purpose is to increase the discoverability of your app and encourage users to download it.
"The languageXchange app developer implemented ASO strategies by using relevant keywords in the app title and description, resulting in a significant increase in their app's ranking and downloads in both Google Play Store as well as Apple App Store."