Unlike Search Engines they do not search through sites for search terms but are sites selected as 'Hits' for that particular search term for that particular Directory. Information is organized by topics. Searches on theses sites search only for keyword matches in the directories' databases. It is one of the most popular tools on the Internet and is an excellent place to begin your searches. Listings are divided from general to specific topics with a final listing of not more than 20 well- chosen, annotated sites.
Hits have excellent summaries.