Search Engines : A search engine is a database system designed to index Internet address (urls,usenet,ftp,image location etc.). The typical search engine contains a special program called spiders( also sometime called a "bot" or "crawler"), the spider accepts a url, it then goes to that web site and retrieves the copy of the file found there. Sometime later, the search engine will process that copy of the file, distilling it down to the bare essential data it needs for the data base. While most search engines request both a url and an e-mail address, the search engine makes the determination as to what data ends up in the database. In short, given a url, an automated process occurs which results in your site being included into the index.
Directories : A directory is basically a manual entry database system. You, as the end user submitting your url, will supply the directory with all of the needed information during the submission process. At a minimum, this information includes, url, title and a short summary of your website. Rarely will the directory have any program capable of visiting your website, although a few directories do have a simple spider capable of verifying that the url you provided was a valid url.
There are two spider classes, Deep and Shallow. A deep spider will take a url and spider all of the pages within the site, no matter how many levels of directories it needs to traverse. A shallow spider can do one of two things, it can either spider the url given and stop, or only spider those urls it finds within a single level of directories.
All different search engines have different spiders and their way of searching:
Infoseek (Sidewinder)- The Infoseek search engine, indexes pages with its spider Sidewinder. It only indexes the pages that you have submitted (it wont traverse or crawl through your site). Infoseek, gives highest priority for keywords in the page title.
Inktomi (Slurp)- Inktomi (pronounced INK TUH ME : stands for a crafty Indian Spider) is the result of a couple super geeks at the University of California at Berkeley. The Inktomi Spider Slurp gives highest priority for keywords in the page title. It also gives a higher priority for keywords in META tags and relevance in page text.
Hotbot/AOL (Inktomi's Slurp)- Even though Hotbot uses the Inktomi search service, it will rank and prioritize results to its own suiting using both Direct Hit influenced data and it's own internal data. Hotbot is owned by Wired Digital but was recently purchased by Lycos.
Altavista (Scooter)-The Altavista search engine starts by spidering your entire site with its spider Scooter. Although lately Scooter hasn't been scooting too well. Scooter may take up to three months to spider and index your entire site (if it is going to crawl your site at all). It normally spiders about 2-10 pages per site in any week. Sometimes Scooter needs a good swift kick to get it to index certain pages.
Lycos (T-Rex)- Lycos has now full integrated the Open Directory Project (ODP) into its mainstream results pages. Certain categories of ODP sites pull extremely well from the Lycos version of the ODP. It is very wise to get your site properly listed in the ODP.
Excite (Architext)-The Excite indexer uses an in-depth indexing algorithm to determine keyword relevance. The spider Architext, traverses the site and indexes the data found on the pages. The indexer attempts to summarize the site by selecting the most relevant sentence for the summary
WebCrawler (Excites Architext)- Webcrawlers indexing methods are sporadic and inconsistent. It would seem that WC crawls pages when it can. In the last year, I've had pages show up in one day, and other times it was two months. This makes researching WC site ranking methods on an ongoing basis not impossible but very difficult.
Google (Backrub or GoogleBot)- Google uses a PageRank system for the central basis of its indexer. It gives a higher priority to site linkage. There are also other complex factors that go into the ranking system.
So now you know all about search engines and how they index web pages. It is very important that your page is optimized to get a higher rank like using proper keywords and contents to promote your web site, there is only one product in the market that you can relay on and that is Submission 2000 . It can optimize your web page for you and also check your ranking in the major search engine so you can tell how well the site is working, whether it need extra work or not.
Imagine free web site promotion, with search engine, once you obtain those top positions, they will bring in new customers for free and not just normal traffic, these are people who are specifically looking for the products and/or the services that you are providing.
Check following links for more information on web site promotion:
Why search engine are so important in E-commerce?
Apex Pacific web site promotion specialist and maker of Dynamic Software series
Tips on making your page search engine friendly
Great info on how search engine works
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