How do I search for a user?

How does Google convert unstructured data into structured data to give the user a rich search experience?

Q1) What tools do search engine giants like Google use to convert the unstructured web data to structured web data to enable good search? Q2) What parameters are used for classifying data as structured or unstructured? Q3) Is unstructured data useful to search or information retrieval systems in anyway possible?
Answer:

Unstructured data means the data on the web page and structured data means data in the database. They do not convert unstructured data to structured data because database cannot handle the number and complexity of queries that Google faces. Information Retrieval is based mainly on unstructured data so yes it is very important.

Piyush Bhagade at Quora Visit the source

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