Deep Link 可以開啟 app 的特定頁面，而不僅僅是打開 app 首頁而已。

In the context of mobile apps, deep linking consists of using a uniform resource identifier (URI) that links to a specific location within a mobile app rather than simply launching the app.

Deferred Deep Link (延遲深度連結)

與 Deep Link 的差異是，Deferred Deep Link 會先判斷裝置是否已經安裝 app ，若沒有安裝便先引導到載點，安裝完畢後再到指定的 Deep Link。根據不同的裝置，引導開啟的路徑也都會不一樣，像是 Android 系統會開啟 Google Play Android; iOS 系統則是開啟 App Store。

Deferred deep linking allows users to deep link to content even if the app is not already installed. Depending on the mobile device platform, the URI required to trigger the app may be different.

效益

提升用戶體驗，減少導流的過程中的斷點！

參考連結：
https://en.wikipedia.org/wiki/Mobile_deep_linking
https://progressbar.tw/posts/264
https://codertw.com/程式語言/666241/