Google's search engine works through three main processes: 1. Google web crawlers follow links throughout websites and grab content to add to search indexes. Crawlers only follow links between pages and sites. 2. Google indexers take the full text of pages from crawlers and store them in Google's database. 3. Google query processors consider over 100 factors to determine the most relevant documents for a search query and return results in under half a second.

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.