It may come as a surprise to more experienced players in the industry, but there are actually a lot of people who confuse two wordpress websites, namely (1) the one with the address that ends in .com and (2) the one with the address that ends in .org.
These two are completely different from one another, although they cater to the same popular online publishing tool. WordPress.com, on the one hand, leads you to the site where you can use wordpress. Its where webmasters with wordpress hosting sign up for and log into their account. On the other hand, WordPress.org is a website dedicated to the publishing tool itself. This is where you can go to for more information about the tool as well as get support through customer care and user forums.
Knowing this will at least help beginners in wordpress web hosting know which site to go to. Its highly recommended that new hosts should visit wordpress.org to know more about how to get started with their blog.