This is a sample page. It differs from a blog article because it always stays in the same place and (in many themes) appears in the navigation menu. Many people start with an About page that introduces them to site visitors. A presentation like this might appear:
Hello! I am a bike messenger by day, aspiring actor by night, and this is my website. I live in Los Angeles, I have a big dog named Jack, and I like piña coladas. (And take the rain)
…or something like that:
The XYZ Contraptions Company was founded in 1971 and has been providing the public with top-quality contraptions ever since. Located in Fantasiland, XYZ employs over 2,000 people and makes all sorts of fantastic contraptions for the Fantasiland community.
As a new WordPress user, you should go to your Dashboard to delete this page, and create new ones for your content. Have fun!