Here are some basic definitions to get you up to speed on RSS and Blogging that I found very helpful.

Aggregator
Two main types of aggregators: web-based aggregators and desktop/software aggregators. Web-based aggregators allow individuals to subscribe to feeds online and read feeds in a web browser. Desktop aggregators are software programs installed locally that updates when feeds are updated. The aggregator shows new information and allow for users to read feeds.

Atom
An XML-based file format. Although Atom is not the same as RSS, it has similar functions. FeedForAll will convert Atom feeds to RSS v2 feeds.

Blog
Blog is short for weblog. A weblog is a journal that is frequently updated and intended for general public consumption. Blogs generally represent the personality of the author or the Web site.

Feed
A feed is a machine readable (usually XML) content publication that is updated regularly. Many weblogs publish a feed (usually RSS). Readers can subscribe to these feeds to automatically check for updates

Feed Validator
Tests the formatting of feeds to ensure that they are correctly formed.

OPML
OPML an XML-based format that allows exchange of outline-structured information between applications running on different operating systems and environments.
http://en.wikipedia.org/wiki/OPML

RDF
Resource Description Framework. The frameworks for RSS version 1. The RSS v1 format is quite different from all other RSS versions.

RSS
Really Simple Syndication or Rich Site Summary

Syndicate
To supply information or content for simultaneous publications in several periodicals or web sites

Weblog
An online journal or diary that is frequently updated (also referred to as a blog).

XML
eXtensible Markup Language. RSS is based on XML.