Search engines work by storing information from billions of web pages using web crawlers, indexing and classifying that data, and returning the most relevant results to user queries within 1 second. Google operates 11 data centers around the world containing over 100,000 computers to handle the massive amount of data and localization requirements, with each new data center costing over $600 million.

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