A deep link
is a URL that links to content "deep" in your site structure.
You may have a product you are trying to sell, or a video series you are trying to promote. With a deep link you can have another app link directly to that piece of content in your app.
In your app, you would need to create a URL schema so that your app system will know what to do.
For instance, for my app BibleTalk.tv
the url schema is bibletalktv://
These links may also be called Universal Links on iOS.
To learn more about deep links, see these help guides:
Christian. Husband. Father. Goofball.
Technology Manager for BibleTalk.tv