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Search Engines and How They Operate
Search Engines Cheap Sports NFL Jerseys , I’ll sometimes make reference to them as SE, are special sites on the Web that are meant to support people find intelligence stored on other sites. There are differences in the methods several Search Engines function, but they all perform three basic tasks:
They search the Internet – or select pieces of the Internet – based on important words,
They store an index of the words they come up with, and where they find them Cheap NFL Jerseys Free Shipping , and
They give permission to users to look for words or combinations of words found in that index.
In the beginning Search Engines accumulated an index of a few hundred thousand pages and documents, and got maybe one or two thousand inquiries each day. Today, a top Search Engine will index hundreds of millions of pages, and answer to tens of millions of queries per day.
Before a Search Engine can tell you where a file or document is, it must be found. To get information on the hundreds of millions of Web pages that exist Cheap NFL Jerseys From China , a Search Engine employs special software robots, called spiders, to build lists of the words found on Web sites.
When a spider is building its lists, the process is called web crawling.
In order to construct and maintain an useful list of words, a SE’s spiders have to look at a lot of pages. How does any spider start its travels over the Web? The usual starting points are lists of heavily used servers and very sought-after pages. The spider will begin with a popular site Cheap NFL Jerseys China , indexing the words on its pages and following every link found within the site. In this way, the spidering system quickly starts to travel, spreading out across the most widely used portions of the Web.
Once the spiders have finished the task of finding data on Web pages, the Search Engine must maintain the information in a way that makes it handy. There are two fundamental components involved in making the gathered data accessible to users:
The information stored with the data, and
The ingredient by which the data is indexed.
In the simplest case Cheap NFL Jerseys , SEs could just keep the word and the URL where it was found. In reality, this would make for an engine of narrow use, since there would be no way of knowing whether the word was used in an important or a trivial way on the page, whether the word was utilized once or a large number of times or whether the page contained links to added pages containing the word. In other words, there would be no way of putting together the ranking list that tries to present the most useful pages at the top of the list of search results.
To create for more useful results Cheap Jerseys Wholesale , most Search Engines hold more than just the word and URL. The SE might store the amount of times that the word appears on a page. The engine might appoint a weight to each entry, with increasing values appointed to words as they appear near the top of the document, in sub-headings, in links, in the META tags or in the title of the page. Each commercial Search Engine has a different formula for assigning weight to the words in its index. This is one of the reasons that a search for the same word on distinctive Search Engines will produce different lists Cheap Sports Jerseys , with the pages presented in different orders.
An index has a single goal: it allows advice to be found as speedily as possible. There are quite a few ways for an index to be built, but one of the most efficacious methods is to build a hash table. In hashing, a formula is applied to attach a numerical value to each word.
The method is intended to evenly allocate the entries across a predetermined number of divisions. This numerical distribution is different from the distribution of words across the alphabet, and that is the code to a hash table’s effectiveness.
When a person requests a search on a keyword or phrase, the Search Engine software searches the index for fitting data. The software then provides a report back to the searcher with the most relevant web pages listed first.
End of part one of this article seo series look out for part two.
I’ll also cover more information about search engines in detail in future articles and videos
Till then
Bye for now
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Posted On : May-19-2011 | seen (277) times | Article Word Count : 472 |
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