This section lists search
engines and directories. The difference between the two
is that search engines use Robots, sometimes called Bots,
or Spiders, which crawl over the web at regular intervals
searching for new web sites. If you have a web page, you
should submit your url to as many crawlers as you can,
since they are not guaranteed to notice you when they
do a crawl. A directory does not use Bots. Instead
it uses human beings to input web addresses manually.
The biggest and best known directory is Yahoo.com