For example, this means that a user navigating from page 1 (p1) to page 2 (p2) to p1 to p2 to page 3 (p3) to p1 creates a back stack of p1, p2, p1, p2, p3, p1.
If the user modified content in the second instance of p2 in the back stack, but navigates back using the Back button to the first instance of p2 in the back stack, previous changes don’t appear on that page unless the page refreshes the data; the view is a snapshot of how the user saw that page at that point in navigation.