Hi Moshe and welcome.
If, by the lack of a back button, you are referring to, for example, a link in an email opening your browser, you can get back to your email client by four finger swiping across the screen. This action cycles between open apps.
On Android devices, there's a back button that lets you back out of apps, actions, steps, etc. One universal button that's very handy, which has no iOS equivalent.
On Android devices, there's a back button that lets you back out of apps, actions, steps, etc. One universal button that's very handy, which has no iOS equivalent.
I suppose the closest iOS devices come to that is the Home button.