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Web Search Engines

* a program that searches documents for specified keywords and returns a list of the documents where the keywords were found.

* sending out a spider to fetch as many documents as possible.

* an indexer, reads documents and creates an index based on the words contained in each document.

* proprietary algorithm to create its indices such that, ideally, only meaningful results are returned for each query.

How do web search engines work?

* finding specific information on the vast expanse of the World Wide Web.

* it would be virtually impossible to locate anything on the Web without knowing a specific URL.

Algorithm of Search Engines

* to determine the relevance of the information in the index

* frequency and location of keywords on a Web page.

* the way that pages link to other pages in the Web.

Types of Search Engines

1. Web crawler-based Search Engines

a. Crawler-based search engines are what most of us are familiar with - mainly because that's what Google and Bing are.

b. They are called Crawler because the software produced crawls the web like a spider, automatically updating and adding new pages to its search index as it goes.

2. Human Powered Search Engines

c. A search engine that uses human participation to filter the search results and assist users in clarifying their search request. The goal is to provide users with a limited number of relevant results, as opposed to traditional search engines that often return a large number of results that may or may not be relevant.

i. Amazon

1. Amazon's NowNow

ii. ChaCha

2. Means "to search" in Chinese

3. September 2006 by Scott Jones and Brad Bolstic

4. Independent contractors (Guides)

iii. Jumper 2.0

5. Bookmarking

6. Allow users to tag any data, keyword and descriptions

iv. Sproose

7. Created: August 2007 by...