How does Google Search work?

When you search a web in Google, you are not actually searching the web, instead you are searching the Google’s Index of the Web. These Indexes are searched from web by Spiders

What are Spiders?

Spiders are software programs that crawls the web. Spiders start by fetching few web pages and they follow the links on that pages and fetch the pages they point to and follow the link on those pages and fetch the pages they link to and so on… until we index a pretty big chunk of the web, many billions of pages stored across thousands of machines. (i.e. Spiders keeps on going from one to many pages constantly for Indexing)

<the following of the link from pages are done by crawlers and spiders downloads the index. Say a Crawler is simply a subset of Spiders>

<A developer/site owner chooses whether his site can be crawled or not, so there are many pages that even Google guru can’t find>

Okay, now

What happens when you type in your ‘Search Word’ and Press Enter<return>

For Example, your Search word is- ‘Elephants Weight in Tons’

Google’s Spider searches the Google’s Index to find every page that includes those terms, in this example there are Hundreds of Thousands of possible Results.

How will google decide? Which few documents I really want.

Simply by Asking questions, like

i) how many times does the page contains the key word

ii) does the key words appears in the Title or in the URL or directly adjacent to the text

iii) does the page includes synonyms for those words

iv) is the page from quality website or low quality or spam

v) freshness of the page

vi) what is the Page Rank of the page.

vii) Translations

viii)Universal search (Web, Image, News, Map, Video, etc.)

<These Questions are called Search Factors by Google, and there are over 200 factors.>

Page Rank:

Is a formula, invented by founders of Google, that rates the webpages importance by looking how many outside links point to it and how important those links are.

Finally, we combine all those factors together to produce each page’s overall score and send you back your search results in about 1/8^th of a second after you submit your search

In the Search results, each entry includes

i)Titles

ii)URL

iii)sniffed of text

to help me decide whether this is the page what I am looking for.

We also see

iv) links to similar pages as search result.

v)Google’s most recent stored versions of that kind of page.

and at the bottom

vi)later searches we want to try next.

And we also get ads about our searches (only if there are any) at the side(right) or at the top.

Google always strives to show ads you want to see and always distinguish ads and search results.

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