They are websites where you can submit your articles for publication so as to generate traffic. if you write an informative, helpful article, readers are likely to visit your site to see what eles you have to offer. You are allowed to write a brief "About the Author" that goes after your article. You can tell who you are, what you do, and have a link to your site. Jim
2 of my favorites is http://ezinearticles.com and http://www.articlecity.com There are a few pieces of software out there that will help automate the process of submitting your articles to various submission sites. The one I use is at http://articlesubmitterpro.com
In addition, type in "Definition of article directory" and what is article directory" into google. You will get some solid responses. Simply spend some minutes to read and glean some ideas. Also visit these great article directory websites. Read their website to get more ideas: www.EzineArticles.com www.GoArticles.com www.SearchWarp.com