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1. How does search engine work ?

2. Easy to understand (?)
• Stores information of the web
• Classify information and rank them
• Bring us with the most relevant content
related keywords

3. Hard to do it (!)
• Billions of Web Pages
• Billions of Gigabytes data
• Every milisecond millions of new data
• Characteristic differences with languages (
localization )
• Requires huge amount of investment
• Respond query less them 1 second

4. Google Data Centers
• 11 Data centers in the world
• Each data center consist of 10.000 Computers
• Last data center cost 600 Million U.S Dollar

5. Google Data Centers

6. Google Data Centers

7. 3 Main aspects of Search Engines
• Web crawling
• Indexing
• Searching

8. Search Engine Scheme

9. Web Crawling
• Walks Around the web
• Follows link from every site
• Retrieves information from web pages html
• Stores information in Data Centers

10. Indexing
• Analyze the stored information by web
crawler
• Classify them
• Rank them

11. Searching
• Keyword query on search engine
• Fetch related links of the keywords
• List them according the relavance