Search engines
Also called "spiders" or "crawlers", search engines constantly visit Web sites on the Internet in order to create catalogs of Web pages. It usually requires no special work on the part of Web masters for their sites to be included in the catalog created by search engines (although, without any special attention, quality, position, and description all is left up to the whims of the gods). Alta Vista is an example of a search engine. Table A lists the leading search engines, and some of their characteristics.

Service	Content	Meta Tag Support	Index Date	Page Popularity Used?	Catalog Update	Spam Penalty
Alta Vista	full-text	Yes	URL	No	4 -6 Weeks	Yes
Excite	full-text	No	No	Some	4 -6 Weeks	Yes
HotBot	full-text	Yes	Yes	No	4 -6 Weeks	Yes
InfoSeek	full-text	Yes	URL	No	4 -8 Weeks	Yes
Lycos	abstract	No	No	Yes	2-4 Weeks	Yes
WebCrawler	full-text	No	No	Yes	6 -7 Weeks	Yes

Full text or abstract
The content entry in Table A shows whether the engine catalogs the full-text of a page or instead creates a description or abstract based on a page's text. Full-text may be better because it ensures that every word from your Web site will be available to match keywords entered by those consulting search engines. "Mostly full-text" generally means that an engine may exclude certain common words.

Index date
The search engines may go out nightly to find new Web pages, but that work means nothing if the search engine catalogs aren't updated with this new information. From the index date, you can get an idea of how long it might take for your site to show up.

Page popularity used
Some search engines determine the popularity of a page by analyzing how many links there are to it from other pages. Pages that are more popular may turn up earlier in a search over less popular pages, or popularity may be used in other ways. [There are some engines, like http://www.goto.com, that list sites that pay a fee higher in the search results than those who don't. This is a misleading practice that can prove very disappointing to users. --DG]