How google search engine work

1. How Google Search Engine work?

2. Google Search Engine
1. What is search engine?
2. How Google work?
- Google web crawler
- Google indexer
- Google query processor

3. What is a Search engine?
Search engine:
 A website dedicated to search other
websites and there contents.
 A program that searches documents
for specified keywords.
 It returns a list of the documents
where the keywords were found.

5. Google web crawler
A spider, also known as a robot or a crawler, is actually a program that follows, or
"crawls", links throughout the Internet, grabbing content from sites and adding it to
search engine indexes.
( hình 1 xuất hiện trước -> biến mất, hình 2 xh! )

6. Google web crawler
Spiders only can follow links from one page to another and from one site to
another.
Video 1

7. Google indexer

8. Google indexer
 Googlebot gives the indexer the full text of the pages it finds.
 These pages are stored in Google’s index database.
Video 2

9. Google query processor
Google considers over a hundred factors in computing a PageRank and determining
which documents are most relevant to a query.

10. Google query processor
Video 3

11. Google query processor
The life span of a Google query normally lasts less than half a second, yet involves a
number of diferrerent steps that must be completed before results can be delivered
to a person seeking information.