Directories are search engines powered by human beings. Human editors compile all the listings that directories have. Getting listed with the web's key directories is very important, because their listings are seen by many people. In addition, if you are listed with them, then crawler-based search engines are more likely to find your site and add it to their listings for free. You should prepare before submitting to any directory.
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Search Engine Marketing & Promotion: The Overall Process
Terms such as "Search Engine Marketing" or "search engine promotion" refer to the overall process of marketing a site on search engines. This includes submission, optimization, managing paid listings and more. These terms also highlight the fact that doing well with search engines is not just about submitting right, optimizing well or getting a good rank for a particular term.