With the latest version of iOS, you can more easily control and access your tabbed webpages in Safari. Managing your tabs in Safari on an iPhone has always been a challenge, mostly due to the small screen size. But with iOS 15, Apple has improved the way you navigate and use your tabbed pages. A new tab screen lets you see and manage all your open tabs in the form of viewable thumbnails.

Link: How to use and manage your tabs in mobile Safari on an iPhone
via http://www.techrepublic.com