If you add a bookmark on your home screen on an iPhone, you will see how different they are. Some, like BBC Future (https://bbc.com/future), look like an app when are opened, and some just redirect you to Safari.
How do I make a website that will look like an app in bookmark?
Thanks
As I mentioned in the comments, you can found more detail in the official documentation about that: https://developer.apple.com/library/archive/documentation/AppleApplications/Reference/SafariWebContent/ConfiguringWebApplications/ConfiguringWebApplications.html https://developer.apple.com/library/archive/documentation/General/Conceptual/AppSearch/WebContent.html