App Store Optimization – A Crucial Piece of the Mobile App Marketing Puzzle With over 2 million mobile apps in the major app stores, getting your app discovered is one of the biggest issues facing mobile app publishers today. If you’re in the mobile app space, it’s important to understand the various methods for marketing your app. We’d like to share with you one very important technique that continues to be overlooked by most – app store optimization (or ASO for short).