Sunday, May 25, 2014

SEO How Search Engine Work or Operate? -part1

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SEO How Search Engine Work or Operate?-part1 

SEO:How Search Engine Work or Operate? كيف يعمل محرك البحث؟
Crawling Building Index

What is the Search Engine Crawler?

Search Engine is Software in Server, this Software handal Huge Information Collected from WebSites Hosted on Server around world. Collected data occurs by method known as Crawling, which take copy from every page not restricted by server host these websites these copy just contain Text Sometime just take important text (like h title tags) Take copy and saves it as Cache Page this cache page still in Search Engine Server even if website deleted. If you see someday site is appear in google but when click the link and redirect you to this page and tell you does not exit any more just return to google and visit cache page. Search Engine as mention is Software and when Handle information that calculated to return result to search page like google. It use complex algorithm .this algorithm is very complex and it has several considerations to return value and exactly information that  Searchers look for it . Google algorithm Known as Panda Algorithm in last few days they just release the 4th version.

Search Engine Have two main functions :

First: Crawling and Building Index.
Second: Providing  answers by calculating relevancy and serving result.

  1. Crawling - is the process of fetching all the web pages linked to a web site. This task is performed by a software, called a crawler or a spider (or Googlebot, as is the case with Google).
  2. Indexing - is the process of creating index for all the fetched web pages and keeping them into a giant database from where it can later be retrieved. Essentially, the process of indexing is identifying the words and expressions that best describe the page and assigning the page to particular keywords.
  3. Processing - When a search request comes, the search engine processes it . i.e. it compares the search string in the search request with the indexed pages in the database.
  4. Calculating Relevancy Since it is likely that more than one pages contains the search string, so the search engine starts calculating the relevancy of each of the pages in its index to the search string.
  5. Retrieving Results - The last step in search engines' activities is retrieving the best matched results. Basically, it is nothing more than simply displaying them in the browser.

Search engines such as Google and Yahoo! often update their relevancy algorithm dozens of times per month. When you see changes in your rankings it is due to an algorithmic shift or something else outside of your control.
Although the basic principle of operation of all search engines is the same, the minor differences between their relevancy algorithm lead to major changes in results relevancy.

How Crawling and Index Build?

First Engine go to website and take the pages (HTML) and save it in it,s sever (make cache) .the engine make list this list contain to important things.
  • The words within the page.
  • Where the words were found.
So looking in html pages for words in every page in site called crawling. listed this word in database (tables).
called engine not index any word so index words in titles, subtitle ,and meta tags or links,
sometimes important words which called keywords in important sites that have high ranks  they are indexed even if not put in titles or subtitles ,meta tags.
sometimes search engine index whole page if it high rank but leveling useless words like and ,or, an ,a .... which take size.others do this like AltaVista.


 How Search Engine Work or Operate?-part 2 Next >>>


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