1caa4152_O_Company___ShiftWeb_Solutions__WordPress_com
[WordPress.org] Self hosted You will have to download the software and find a server to install it in. Self hosting means you can choose any hosting company to store your files so you can make it available on the world wide web. [WordPress.com] 
Hosted by Automattic No need to find a hosting company because Automattic will store all your files for you in their server.
WordPress.org vs. WordPress.com | Atlanta Web Design & SEO Company | ShiftWeb Solutions
WordPress.com