I read on a website the following:
Mobile browsers render pages in a virtual "window" (the viewport), usually wider than the screen, so they don't need to squeeze every page layout into a tiny window (which would break many non-mobile-optimized sites). Users can pan and zoom to see different areas of the page.
I don't have much of experience, can someone please explain using other terms. I didn't understand how the mobile create a viewport and then let the user to zoom in that viewport.
It all means that the page it will fit the mobile's screen when using the meta tag , something like this:
<meta name="viewport" content="width=device-width, initial-scale=1">
So instead of the page showing like desktop view - all shrinked - and then you have to zoom in (a lot) to read, you can just simply scroll, because the content will fit properly the mobile/tablet's screen.
You may or may not be able to zoom depending on the property you use on the meta tag viewport.
This maximum-scale=1 will allow you to block zoom if your initial-scale=1