Link: App Indexing for Google Search — Google Developers

If you want to offer your users the option to open your content in your app if they have it installed from search results, we require you configure both your website and your app to tell us about their relationship, […]I’m a bit confused, that there *are *some apps already out there that intercepts links to their page (e.g. foursquare) by matching URLs and prompts user if they want to open the page with Chrome or their native app (Foursquare). How is this different?