This is an example page. It differs from a blog post 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 might appear like:
Hello! I’m a bike delivery boy by day, aspiring actor by night and this is my website. I live in Los Angeles, have a large dog named Jack and I love piña colada. (And catch the rain)
…or something similar:
The XYZ Gadgets Company was founded in 1971 and has been providing the public with premium quality gadgets ever since. Located in Fantasy Land, XYZ employs over 2,000 people and makes all sorts of cool gizmos for the Fantasy Land community.
As a new WordPress user, you should go to your Dashboard to delete this page, and create new ones for your content. Have a good time!