Do you have a website that shares content with an iOS app? As of iOS 9, you can connect them using universal links, meaning that users can now touch an HTTP link on an iPhone and be sent directly to your app!
In this tutorial, you’ll learn how to link an iOS app to a Heroku website.
...and its possible for Android, too!
Enabling Deep Links for App Content
To enable Google to crawl your app content and allow users to enter your app from search results, you must add intent filters for the relevant activities in your app manifest. These intent filters allow deep linking to the content in any of your activities. For example, the user might click on a deep link to view a page within a shopping app that describes a product offering that the user is searching for.