This is your homepage. It is different from a blog post because it stays in one place and shows up in your site navigation (in most themes).
As a logged-in WordPress user, you can edit this page by clicking on the Edit Page button in the Toolbar. The page can introduce yourself, or your company, to potential site visitors and say something similar:
Hi there!!! I'm a bike courier in daily life and a budding actor in the evenings. I live in Los Angeles, have a cute dog named Jack and I love piña coladas. (And getting caught in the rain.)
...Or something like this:
The XYZ Doohickey Company was founded in 1971 and has been providing quality doohickeys to the public ever since. Based in Gotham City, XYZ employs more than 2,000 people and all do great things for the community in Gotham.
If you prefer to see a list of your latest posts on your homepage, go to your Settings and choose "Your latest posts" as your homepage option.