This is a sample page. It differs from a blog post because it remains in the same place and (in many themes) appears in the navigation menu. Many people start with an About page that introduces them to visitors. It could be a presentation like this:

Hello! I’m a bike messenger by day, aspiring actor by night, and this is my website. I live in Los Angeles, have a big dog named Jack, and I like piña coladas. (And getting caught in the rain)

…or something like this:

XYZ Doohickey Company was founded in 1971, and has been providing quality doohickeys to the public ever since. Located in Gotham City, XYZ employs over 2,000 people and does all kinds of awesome things for the Gotham community.

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