What are App Links?
App Links are unique mobile URLs that take people to a specific in-app page or screen, if the person clicking the link already has that app installed. App Links are open source and cross-platform links supported by iOS, Android, and Windows.
It’s important to note that in order to take advantage of App Links you must have a live, functional mobile website.
App Links originally were introduced to replicate the functionality of iOS Universal Links, and effectively introduce a simple way to turn website links into links for mobile apps that are more useful for browsing mobile users. Therefore, if a normal HTTP/HTTPS link is clicked and the corresponding app is installed, it will open immediately. If the app is not installed, a provided fallback web link will trigger.