How Does Web Search Engine Works? - PowerPoint PPT Presentation

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How Does Web Search Engine Works?

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A web search engine is a software system that is designed to search for information on the World Wide. It works by sending out a Spider to fetch as many documents as possible. Another program, called an indexer, then reads these documents and creates an index based on the words contained in each document. Each search engine uses a proprietary algorithm to create its indices such that, ideally, only meaningful results are returned for each query. – PowerPoint PPT presentation

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Title: How Does Web Search Engine Works?


1
How Does Web search Engines Work
2
Page rank
Indexing
Searching
3
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

Continue
4
  • 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

5
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.

6
  • 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.

7
Search Engine Indexing process
8
Index design factors
  • Merge Factors
  • Storage techniques
  • Index size
  • Lookup speed
  • Maintenance

9
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.

10
  • 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.

11
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.
12
(No Transcript)
13
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"

14
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.

15
Google Architecture Overview
16
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.

17
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