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.

2. Indexing
Searching
Page rank

3.  Page Rank is once the most important part of
Google’s 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
What is an Page rank
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
 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.
 Indexing is the process of creating
indexes for record collections

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

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
Document’s title.

13. Search syntax
 Google’s 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
 It is the process of improving the volume and quality
of traffic to a website from search engines via results.
 Higher a site’s “page rank”, the more visitors it will receive
from the search engine.
 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

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.

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