This is About Us Page. You can edit it at Pages -> About Us in Administrator WordPress Page. It shows detail about history, founder, employee and (maybe) pictures in outdoor trips. If you don't want to show this page, you can edit it at Apprearance->Menus->header_ menu.
If you want to delete this page, you can delete it at Pages in WordPress Admin page, but you shouldn't do it. If you deleted this page, you could restore it by set default button on Layout Settings