This is a sample page. It's different from a post because it stays in place and will show up in your site's navigation (in most themes). Most people start with an About page, which introduces them to potential site visitors. It could be something like this:

Hello! I'm a messenger by day, aspiring actor by night, and this is my blog. I live in Madrid, I have a big dog named Duque and I like pina coladas (and getting caught in a downpour)

…or something like that:

The XYZ Company was founded in 1971 and has been offering quality "stuff" to the public ever since. Based in Madrid, XYZ employs over 2,000 people and does all sorts of amazing things for the Madrid community.

If you are new to WordPress you should go to your desk to delete this page and create new pages with your own content. Have fun!