Suppose you want to buy somthing online or you need to get some
information from internet related any topic you want, then what will you
do ? You will deffinetily go to search engine and try to find related
information.
Now think you got all information from world wide
web through the search engine but did you think how search enginge put
all desired search in front of your eyes. read the following article to
know this.
Search engines consist of five discrete software components:
Spider : A search engine program that downloads webpages.
Spider,
also called a robot or a crawler, is actually the only program that
will follow, or "crawls", links to the Internet, grabbing the content of
sites, and adding it to the search engine indexes.
The spiders
can follow links from one page to another and from one place to another.
This is the main reason why links to your site (inbound links) is so
important. Links to your site from other Web sites provide search
engines more "food" to chew. The more times they find links to your
site, the more times they'll stop and visit. Google is based in
particular on its spiders index their lists to create enormous.
Spiders
find Web pages by following links to other Web pages, but you can also
send web pages directly from a search engine or directory, and ask them
to visit the spider. In fact, it's a good idea to send manually edited
directories like Yahoo, and usually spiders from other search engines
(like Google) to find and add it to the database. It may be useful to
submit your URL directly to the different search engines, as well, but
Spider-based engines usually pick up on the site, regardless of whether
you have sent the search engine.
Crawler : A wandering spider that automatically follows links found on pages.
Component
of search engine that gather listings by automatically “crawling” the
web. A search engine’s crawler (also called a spider or robot), follows
links to web pages. It makes copies of the web pages found and stores
these in the search engine’s index.
Indexer : A blender like program that dissects webpages that are downloaded by spiders.
An
indexer rips apart a page into it's various components and analyze
them. Entities such as, titles, headings, links, text, constructs, bold,
italic, and other style portions of a page are ripped apart and
analyzed.
The database : A warehouse of the pages downloaded and processed.
The
database is the storage medium for all the data a search engine
downloads and analyzes. This can require huge amounts of storage space.
Search engine results engine : Digs search results out of the database.
Ah,
the heart of the beast. It is the results engine's job to decide what
pages matches a users search. This is the portion of a search engine you
interact with when you perform a search. It is also the one part we are
concerned with here.
When a user types in a keyword and does a
search, the search engine decides what to match for results under
varying criteria. The means with which it decides is called an
algorithm. You may hear search engine optimization (SEO) professionals
discuss "algos" from time to time and this is what they are referring
too.
