This is an example page. It differs from posts in that it always stays in the same place and (for most themes) appears in the site navigation. Most of them start with an imprint, the privacy statement or an "About us" page to introduce themselves to potential visitors to the website. It could be there, for example:

Hello! 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, like Piña Coladas, but less (without umbrella) to be left out in the rain.

...or something like that:

XYZ was founded in 1971 and has been supplying 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's inhabitants in many ways.

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!