This is a sample page. It differs from a blog post because it stays in one place and (in many themes) appears in the navigation menu. Many people start with an About page that introduces them to site visitors. It might say something like:
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 Gadget Company was founded in 1971 and has been providing the public with high-quality gadgets ever since. Located in Fantasiland, XYZ employs over 2,000 people and makes all kinds of fantastic gadgets 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. Enjoy!