I have read the following definition regarding web application zone types (Default, Intranet, Internet, Custom, Extranet):
When you extend a web application to one of these zones, you actually create a new separate IIS website that serves the exact same content as other websites in your web application, but they will each have their own unique URL to connect to and can also use different authentication methods.
What does it mean by
serves the exact same content as other websites in your web application
Does it refer to the same content database, but a different site collection?
And what does it mean by
you actually create a new separate IIS website
Does it mean that when I extend a Web application to a new zone, for example Internet, it creates a new Site Collection?
From what I understand, the zones are useful when you want different URLs and authentication methods for the same content. By content does it refer to the same site?
Wouldn't that be unnecessary? I mean, even I have different authentication types for Intranet and Internet users, the content the users access is the same, so an Internet user with anonymous login sees exactly what a Form Based Authentication login user sees.