This is an example page. It’s different from posts because it stays in the same place and (in most themes) is shown in the navigation. Most people start with an About Us page that introduces potential visitors to the site. It might say something like:

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

…or something like:

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

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