This is a sample page. It differs from posts because it always stays in the same place and is displayed (in most themes) in the navigation bar. Most people start with an “About Us” page with an introduction for potential visitors to the site. For example, it could say there:

Hello! By day I work as a bike messenger, by night I’m an aspiring actor and this here is my blog. I live in Berlin, have a big dog named Jack, like the Fantastischen Vier and a cold beer.

As a new WordPress user, you should go to the dashboard to delete this page and instead create a new page with your own content. Have fun!