This is an example page. It differs from posts because it always stays in the same place and (in most themes) appears in the navigation. Most people start with an imprint or an “About Us” page with an idea for potential visitors to the site. There could be, for example:

Hello! During the day I work as a bike messenger, at night I’m an aspiring actor and this is my website. I live in Berlin, have a big dog named Jack, like the Fantastic Four and a cold beer.

… or something like:

Our company XYZ was founded in 1971 and has since produced a lot of high quality ABC for the public. Based in Gotham City, XYZ now has over 2,000 employees and continues to do great things for the whole Gotham community.

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!