The basic truth that you should always remember is that search engines are not human and are developed by human and named it as web-spider or bot. They are also regarded as answering machine. From this truth you can understand that how humans and search engines view the contents of web pages. Like human, search engines are also text-driven. They are always seeking for quality rich king content. Therefore you should always respect the copyrights policy. Search engines basically performs five activities to deliver the best and quality web results; Crawling, indexing, processing, calculating relevancy and retrieving results.1. Crawling:
At first search engines grabs or crawls the web-pages to see what kind of quality rich king contents are located at the specific web address. This kind of task are performed by a particular software program called Spider or Web-Crawler. But in the case of the Google this crawling process is carried out by the Google bot. These kind of Spider, Crawler or Google-bot are responsible for indexing everything that they find throughout their way while following links from one page to another. After the completion of crawling process the next step is of indexing the content in search engine database.
2. Indexing:
In this process web-pages contents found while surfing the crawling process are encoded to save space and are store in the giant database from where it can be retrieved later. Especially this process is carried out to identify the words and expression which describes the page with suitable assigned keywords. Perhaps human are unable to encode and index such a giant data. Therefore, web-spiders or crawlers or bots are assigned to deal with this task.
3. Processing:
Whenever a search is made in a search engines with specific keywords, searches go to pull up information from the giant database. Since it is likely that millions of pages contains the search keywords that are stored in the giant database of search engine. Therefore the search engines start to calculate the relevancy of each and every page in its giant database to indexed it on their web search results page.
4. Calculating Relevancy:
Due to having millions of pages with similar search keywords, the search engines start to calculate the relevancy of each pages stored in their database. For this process they uses their special program called algorithms. The algorithms used by search engines varies from each other. For instance, the algorithm used by Google is different from Yahoo! and Bing. Each of these algorithms has different relative mass for keyword Factor, meta-tags or links. This is the reason why search engines give different web search results for the same search keywords. It is known fact that major search engines like Google, Yahoo!, Bing, Ask etc. keep changing their algorithms periodically. Hence if you want to index your web pages at the top of web search results then you also need to adapt your site pages to the latest update or changes.This is the best reason to devote and invest your permanent efforts to SEO, if you want your site at the top of index page in search engines.
5. Retrieving Results:
Although after calculating the relevancy of site indexed in search engines, retrieving results is nothing more than simply displaying them in the browser. These results are sorted from the most relevant to the least relevant sites content indexed in search engines.
Principle of Operating Search Results by Different Search Engines:
Basically the principle of operating search results by search engines are similar. But minor differences between their algorithms leads to major changes for retrieving results by calculating the relevancy of the sites. Perhaps for different search engines different factors are important to retrieve best and accuracy result. Some SEO expert joked that the algorithm used by Bing is completely opposite to the algorithm used by Google. Now you can understand and imagine that the algorithm used by Google is advanced and is completely different to the others search engine algorithms. About more than 80% of the traffic from search engine is obtained from Google and rest is from search engines and directories like Bing, Yahoo, Ask, etc. This doesn't mean you should optimize your site for Google only because rest 20% of the traffic also matters a lot in your traffic source. For Yahoo! and Bing on-page keyword factors matters a lot as a primary importance, while for the Google internal and external links count are very much critical to rank well. Therefore you need to be patience and hard working towards optimizing your site to rank well in Search Engines and Search Directories.
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