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Search engine
1. Search Engines are tools for locating web
pages.
An interactive tool to help people locate
information available via www.
Web search engines are actually databases
that contain references to thousands of
resources.
4. A number of strategies can be opted to enhance the
performance of search engine…
Boolean Searching
Implied Boolean:Plus & Minus
Truncation Searching(Wild Cards)
Phrase Searching
5. Web crawler, database and the search interface are the major
component of a search engine that actually makes search engine to
work. Search engines make use of Boolean expression AND, OR, NOT
to restrict and widen the results of a search.
Following are the steps that are performed by the search engine:
The search engine looks for the keyword in the index for predefined
database instead of going directly to the web to search for the
keyword.
It then uses software to search for the information in the database.
This software component is known as web crawler.
Once web crawler finds the pages, the search engine then shows the
relevant web pages as a result. These retrieved web pages generally
include title of page, size of text portion, first several sentences etc.
These search criteria may vary from one search engine to the other.
The retrieved information is ranked according to various factors such
as frequency of keywords, relevancy of information, links etc.
User can click on any of the search results to open it.
6. Time Savings:
A search engine saves you time in two ways: by
eliminating the need to find information manually,
and by performing searches at high speeds.
Relevance:
When a search engine scans a website, it scores the
content for relevance to particular search words.
Advanced Search:
In addition to keywords, search engines let you use
advanced search options to refine your results.
7. Inaccurate Search Engine Rankings:Search
engine rankings are frequently inaccurate.
Significant Links to Your Website:Your
website’s rankings will gain little or no
benefit by attracting links from websites that
are unrelated to the material on your own
website.
Personalised Search Results:Most web users
make little effort to secure their privacy
online
8. Search engines are web application that displays a list of relevant
resources available using a database created from indexing
information gathered by web crawlers
Web directory displays a list of relevant resources by a database
created by a hierarchical catalogue of websites submitted for
listing, where websites are reviewed by human editors.
Search engines collect information about a website automatically
for indexing, while Web directories require a submission from the
website to be listed in the directory.
Websites has to comply a certain criterion to be listed in a
directory, to assure standard and quality, while a search engine
will automatically list irrespective of the quality of the content.
Though search engines use special algorithms to filter and
provide the most relevant and useful information for users.
Some directories charge for listing in the directory, while a search
engine does not charge from the publishers.
