This is an example page. It is different from posts, since it always stays in the same place and (on most themes) displayed in the site navigation. Most start with an imprint, the Privacy Policy or an "About Us" page, to introduce yourself to potential visitors to the website. For example, it could say:
Hallo! During the day I work as a bicycle courier, at night i am an aspiring actor and this is my website. I live in berlin, have a big dog named Jack, mag Pina Coladas, however less (without an umbrella) to be left out in the rain.
…or something like this:
Company XYZ became 1971 was founded and has been providing the public with high-quality products ever since. At its location in a small city, the company employs over 2.000 people and supports the city dwellers in many ways.
As a new WordPress user, you should your dashboard call, to delete this page and create new pages and posts for your site. Have fun!