This is an example page. It differs from posts in that it always stays in the same place and (on most themes) appears in the site navigation. Most start with an imprint, privacy policy, or an “About Us” page to introduce themselves to potential site visitors. For example, there could be:

Hi! 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, like piña coladas but not so much being left out in the rain (without an umbrella).

… or something like:

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

As a new WordPress user, you should go to your dashboard to delete this page and create new pages and posts for your site. Have fun!