How Does Navigation i xamarin.forms Works???

Hi All,
As I am using xamarin.forms for my application in android which I have to navigate from one page to another. My question is, if navigating from one page to another page adds it to the navigation stack. For example, If my app has navigation such as Page1 --> Page2 --> Page3 --> Page4 --> Page1 (It behaves like cycle) will it replace Page1 when I navigate to that page on second time or will it be adding it to the stack. Can anyone explain about navigation in a simple way??

Thanks in advance