Deep links are a kind of hyperlink that points to a specific place or function inside a mobile app. A deep link on a mobile Web page or in an e-mail, for example, might take you to a specific product in a shopping app or song in a music app.
Support for deep linking has been built into Apple and Google’s mobile operating systems for some time. It allows app developers to give URL-like identifiers such as “iOSApp://location/123456” to specific sections within an app. However, uptake by mobile app developers was initially slow due to differences in how the feature worked on different operating systems and a lack of broad support for their usage.