| Search Engine |
| What is a search engine ? |
| Search engines utilize indexing software agents often called robots or spiders. These agents are programmed to constantly "crawl" the Web in search of new or updated pages. They will essentially go from URL to URL until they have visited every Web site on the Internet. |
| When visiting a Web site, an agent will record the full text of every page (home and sub-pages) within the site. It will then continue on to visit all external links. Following these external links is how search engines are able to find your site regardless of whether or not you register your URL with them. Submitting your URL, however, does speed up the process. It notifies an agent to visit and index your site instead of waiting for it to eventually locate you through one of your external links. |
Robots will then revisit your site periodically to refresh the recorded information. The revisiting of links is the reason why some search engines don't require you to inform them of dead links. Eventually, their robot would try unsuccessfully to update the information on a dead link and realize it no longer exists.
Finally, an easy way to tell whether a Web index is a search engine as opposed to another type of directory is by the information it requires when adding your URL. A true search engine will only need the Web address. The indexing agent takes care of the rest. |
| How do search engines differ from directories, announcement sites, and guides on the Web? |
| Directories: |
| The main difference between a search engine and a general directory is that a directory will not list your URL if you do not register it with them. They do not make use of indexing software agents and so have no way of knowing it's out there. As a result, their registration form will be considerably longer than just your URL. Directories are usually subdivided into categories and you have to submit your URL under the most appropriate heading. |
| Announcement Site: |
The explosion of sites being added daily to the Web has created a need for announcement sites that track all of the new sites that join the Internet. Announcement sites are not only useful for Webmasters and marketers to kick-off their online promotion campaign, but also for users to keep current on what's happening with the WWW. Depending on the announcement site, different Internet documents can be announced -- new web pages, new articles as well as new resources. The time period policy also differs from announcement site to announcement site, but all "announcements" are posted for a temporary period of time. Once removed from the What's New section, most announcement sites archive these pages so users can continue to access them.
Guides & Cool Sites: |
| Guides are quickly becoming an important source for finding interesting and useful sites on the Web. In general, Guides review and rate only a small percentage of all sites submitted. Therefore, make sure your site is "rate-worthy" before posting. Most of the guides allow reviewed sites to use their special icons as a sign of quality. Cool sites usually select one new Web site every day. Getting selected as a cool site will attract high traffic, but that traffic will usually only be experienced for a temporary period of time. |
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