General overview of what Wordpress is and is not.
What is the difference between wordpress.org and wordpress.com? Wordpress.org is open source version, lives on your server/hosting free to use Wordpress.com is hosted for pay and specializes on blogging. Both are connected to the smart invetors/developers of wordpress. Also, WordPress is written in php.
If we download and unzip from wordpress.org and look at files and folders, 'wp-content' is really the only folder we deal with as users. This is were content you upload as well as plugins and themes live.