This is a sample page. It differs from posts because it stays in one place and is shown in your site's navigation (in most themes). Most start with an About page to introduce themselves to potential site visitors. You could say something like this:
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, I like Piña Coladas, but I like less being left out in the rain (without the umbrella).
... or something like:
Company XYZ was founded in 1971 and has been providing the public with high-quality products ever since. At its location in a small city, the operation employs over 2,000 people and supports city residents 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 website. Have fun!