Search Engine

Search engines are programs that search documents for

specified keywords and returns a list of the documents where

the keywords were found.

A search engine is really a general class of programs

“Search engine” is the popular term for an Information

Retrieval (IR) system.

Search Engine Definition

Web Crawling Indexing Searching

Working of Search Engine

Web search engines work by sending out a spider to fetch as many documents as possible

Spider:  an automated Web browser which follows every link on the site

Web Crawling

 Data about web pages are stored in an index database for use in later queries

 Index is to allow information to be found as quickly as

possible.

Indexing

Document Processor Query Processor Search & Matching Function Ranking Capability Summarizing & Presenting Documents

Search Engine Modules

Meta Search Engine

Features of Meta Search Engine

A meta search engine (also known as a multi-threaded engine) is a search

tool that sends your query simultaneously to several search engines (SEs),

Web directories (WDs) and sometimes to the so-called Invisible (Deep)

Web, a collection of online information not indexed by traditional search

engines.

A search engine that queries other search engines and then combines the

results that are received from all.

After collecting the results, the meta search engine (MSE) will remove the

duplicate links and, according to its algorithm, combine/rank the results into

a single merged list.

Search Engine Optimization

Features of SEO

Search engine optimization (SEO) is the process of improving the visibility of a website or a webpage in a search engine’s "natural" or un-paid search result.

SEO is a technique which helps search engines find and rank your site higher than the millions of other sites in response to a search query

SEO is the activity of optimizing Web pages or whole sites in order to make them more search engine friendly, thus getting higher positions in search results.

On Page SEO:This includes providing good content, good keywords selection. putting keywords on correct places, giving appropriate title to every page etc

Off Page SEO:This includes link building, increasing link popularity by submitting in open directories, search engines, link exchange etc

Types of SEO