How Does Web Search Engine Works?

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How Does Web search Engines Work
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Page rank
Indexing
Searching
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What is an Page rank

• Page Rank is once the most important part of
  Googles ranking system and search engine
  optimization.
• Page Rank is a link analysis algorithm applied
  by Google.com that assigns a number or rank to
  each hyperlinked web page within the World Wide
  Web

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• Google assigns a numeric weighting from 0-10
• for each webpage in the internet. This page rank
• denotes a sites importance in the eyes of Google.

• A hyperlink to a page counts as a vote of support

• A web crawler may use page rank as one of a
• Number of important metrics it uses to determine
• Which URL to visit next during crawl of the web

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What is an Indexing

• Indexing is the process of creating indexes for
  record collections

• Search engine index is the place where all the
  data the search engine has collected is stored.

• Search engine indexing is the process of a
  search engine collecting, parses and stores data
  for use by the search engine.

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• The purpose of storing an index is to optimize
  speed and performance in finding relevant
  documents for a search query

• Without an index the search engine would scan
• Every document in the corpus, Which would require
• considerable Time and computing power.

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Search Engine Indexing process
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Index design factors

• Merge Factors
• Storage techniques
• Index size
• Lookup speed
• Maintenance

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Web search Engine

• A web search engine is a software system that
  is designed to search for information on the
  World Wide

• These pages are retrieved by a web crawler
• An automated web browser which follows
• every link it sees.

• Another program, called an indexer, then reads
  these documents and creates an Index based on the
  words contained in each document.

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• The contents of each page are then analyzed
• to determine how it should be indexed

• Each search engine uses a proprietary algorithm
  to create its indices such that, ideally, only
  meaningful results are returned for each Query.

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A User enters a query in to a search engine, the
Engine examines its index and provides a listing
of best matching web pages according to
criteria, Usually with a short summary
containing the Documents title.
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Search syntax

• Googles advanced search web form gives several
• additional fields which may used to qualify
  searches by
• search criteria as date of first retrieval.

• All advanced queries transform to regular
  queries, usually with additional qualified term.

• Google's search engine normally accepts queries
  as a simple text, and breaks up the user's text
  into a sequence of search terms, which will
  usually be words that are to occur in the
  results, but one can also use Boolean operators,
  such as quotations marks (") for a phrase, a
  prefix such as "" , "-" for qualified terms or
  one of several advanced operators, such as
  "site"

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Search engine optimization

• Search engine optimization (SEO) is the process
  of affecting the visibility of a website or a web
  page in a search engine's "natural" or un-paid
  ("organic") search results

• It is the process of improving the volume and
  quality
• of traffic to a website from search engines via
  results.

• Higher a sites page rank, the more visitors
  it will receive from the search engine.

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Google Architecture Overview
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Conclusion

• Google is designed to be a scalable search engine

• The Primary goal is to provide high quality
  search result
• Over a rapidly growing world wide web.

• Google employs a number of techniques to
  improve
• Search quality including page rank, anchor text,
  and
• Proximity information.

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