How Do Search Engines Work How Are Pages Ranked For Relevancy

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How Do Search Engines Work?How Are Pages Ranked
For Relevancy?
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2 Types of Search Engines
Crawler - based (spider)
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2 Types of Search Engines
Crawler - based (spider)
Human-Powered Directories
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Crawler-Based

• Visits web sites and read them
• and also follows links on the pages.

• The information it finds while
• spidering is put in an index or catalog.

• When someone makes a query,
• the search engine searches through
• its catalog to find matches.

Upside Changes to sites are picked up on a
regular basis.
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Human Powered Directories
1. Web authors can send in a description of
their site to the search engine operators who
then categorize the pages and place them in their
catalog or index creating directories.

• Search engine editors review sites and based
• on their reviews and summaries, a site is placed
• in the appropriate directory.

ProblemMake a change on your site, will have no
immediate effect on your listing.
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How Are Pages Ranked For Relevancy?
They follow rules called algorithms.
An algorithm is step by step procedure for
solving a problem or accomplishing an end.
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How Are Pages Ranked For Relevancy?
2 General Rules Followed

• Location/Frequency Method
• Or, where is the term located on the page and
• how often does it appear?

Is it in the TITLE? Is it near the top if the
page? How many times does it appear on the page
compared to other words?
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How Are Pages Ranked For Relevancy?
2 General Rules Followed

• Location/Frequency Method

2. Off Page Factors

• Link analysis
• What pages are linked to the page and are those
  pages relevant to the term being searched?

a. Click through measurement When people are
searching, are they actually clicking on the site
shown in the search results or are they clicking
through? If not, the site will get a lower
ranking.
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Another consideration
Meta tags can be created on the web page HTML
which are located near the top and include key
words that the authors of the web pages hope are
picked up by the search engine.
Example
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But what can this all mean Master?
Oh Grasshopper! When traveling down the road of
knowledge, it is important to use several
search engines since no two are alike. The
diligent will always be closer to the Truth than
the slackers.