Collections - Specifically About The Request.Cookies Object

I have a question specifically about getting the current cookies set to a particular visitor on an ASP.NET webpage. I understand you need to use Request.Cookies - and by default it returns a collection of all cookies set, as an HTTPCookieCollection. However, the MSDN documentation states that you do: Request.Cookies("Username") as an example, in order to fetch an individual cookie and then compare whether it is set, etc. All fine and dandy but why adding parentheses and a string does the type suddenly change to
HTTPCookie.

I understand HTTPCookie is for dealing with individual cookies and HTTPCookieCollection is for dealing with multiple cookies at a time for like iteration purposes, etc., but I don't understand when on the MSDN documentation it explicitly states that the Request.Cookies property (the Cookies property) is of type HTTPCookieCollection, and if you do what I explained it changes the type (I can see this from IntelliSense) and it does not state this happens in the MSDN documentation. I'm not asking about the MSDN documentation lol, but why this happens when adding the parentheses and a string denoting the cookie name. I'm still pretty new to Visual Basic. By the way, I'm doing this all in Visual Web Developer although using VB as the language of choice.