What is a Search Engine? Part 2b

A search engine is a mechanism that allows for pieces of information from many different parts of the Internet be retrieved once a specific Word or phrase had been entered, and searches have found results that match the criteria that the user has entered.

Firstly, a device called a Web Crawler is used to search the entire World Wide Web, and goes through and stores every page that comes up with the entered search criteria. The search engines then rank certain items of info or sites relating to the entered criteria by a few different ways. The first is to save a Cache (part or all of a source page) and then organises the index of pages in order of relevance. This is the way that Google's search engine works. Others , such as Atavista, takes every word of every page that relates to the search, and then index all the words, and this means that their cache always holds the text entered, or search criteria.

when one page comes up before another, alot of the time this is due to the cache being more relevant, and this is due to there being more key words that match the entered criteria.
Although some pages are more relevant than others, in that the caches that they hold contain more relevant search outcomes, some search engines are funded and supported by Advertising, and as such allow for their higher paying customers to receive a higher index rank in exchange for payment. this is not always the case though, as some search engines, such as Google, open up a separate results section for their contributing clients.

My favourite search engine is Google. I like it because it is easy to use, I am familiar with it, and it has a lot of new and useful software under its company and site. some of these extra programs include:
-Google maps
-University search
-Image search
-online Documents and spread sheets
-Google Earth
-Google Translate
-Google News
and Blogger.com!!

Recently, Google has been in the news for a few reasons.
One is that they are including three new software updates; , PC Tools Spyware Doctor Starter Edition, Symantec Norton Security Scan and Google Photos Screensaver.

Link to the site: http://www.informationweek.com/software/showArticle.jhtml?articleID=198700381

This will allow for increased security online, which is the most important recent addition, and protecting your computer from spyware that can be picked up on sites you frequent on Google is also another important feature.