Region 

Defined areas of a page where content can be placed. Basic regions include: Header, Footer, Content, Left sidebar, Right Sidebar. Content is assigned to regions via blocks. They can be ordered by weight within regions to define the order in which they display. Content with a more negative weight, such as-10, will appear above content with a more positive weight, such as 1.

Role

A name for a group of users, to whom you can collectively assign permissions. There are two predefined, locked roles for every new Drupal installation: authenticated user (anyone with an account on the site) and anonymous user (those who haven't yet created accounts or are not logged in). Additional roles can be created and users can belong to more than one.

RSS

Really Simple Syndication. A family of Web feed formats used to publish frequently updated content such as blog entries, news headlines or podcasts. An RSS document (which is called a “feed” or “web feed” or “channel”) contains either a summary of content (“teaser”) from an associated web site or the full text. RSS is one of the many ways of connecting a Drupal website with external sites, systems and data. (In our distro, the WDC Feeds module/feature allows users to easily set up RSS and iCal feeds on their D7 site with presets for common UNT feeds.