You probably already know what a search engine is. Google is one of the most popular ones out there. You type in a word and and it gets back to you with plenty of results.
How does it do that?
In this blog post, I will try to explain it all in the simplest possible way.
There are three types of search engines:
1. Crawlers, Ants, or Spiders are powered by robots;
2. A second type of search engine is powered by humans;
3. The third type is a combination of robots and humans.
Crawler or robot-based search engines use automated software agents to go to a website, read the information on it and return all that information back to a central location where the data is indexed. Search engine administrators decide how often this robot or spider will return to that website to update information for the central data base.
Human-powered search engines pay humans to submit information. This data is then indexed and catalogued. The shortcoming here is that if the information is not submitted, it never gets catalogued.
How do Search Engines Actually Work?
Here’s what happens.
When you type in 'kids crafts' as your keywords. The database is searched by the search engine you are using: Google, Bing or Yahoo.
The search engine then goes through the index and comes up with anything that fits both keywords: kids and crafts. If there are many many documents or web text containing those two words you can refine your search by adding key words. For example: kids’ crafts, papier mache. Or you might specify: kids crafts camping or kids crafts preschoolers.
The same keywords using a different search engine might well produce a different list because their data bases will all differ and the way they collected the data may also differ. More on this later.
Hope I've been able to help you understand the task of a search engine, but if you have any questions, just let me know and I'll be glad to answer them.:)
How does it do that?
In this blog post, I will try to explain it all in the simplest possible way.
So What Actually is a Search Engine?
Search
engines
are programs, very clever ones, that look for documents and websites for specific
keywords. The search engine produces a list of the documents and
websites where the 'keywords' can be found. Examples of popular search engines
include Google, Ask, and Yahoo among many others.
Types of Search Engines:
There are three types of search engines:
1. Crawlers, Ants, or Spiders are powered by robots;
2. A second type of search engine is powered by humans;
3. The third type is a combination of robots and humans.
Crawler or robot-based search engines use automated software agents to go to a website, read the information on it and return all that information back to a central location where the data is indexed. Search engine administrators decide how often this robot or spider will return to that website to update information for the central data base.
Human-powered search engines pay humans to submit information. This data is then indexed and catalogued. The shortcoming here is that if the information is not submitted, it never gets catalogued.
How do Search Engines Actually Work?
Here’s what happens.
When you type in 'kids crafts' as your keywords. The database is searched by the search engine you are using: Google, Bing or Yahoo.
The search engine then goes through the index and comes up with anything that fits both keywords: kids and crafts. If there are many many documents or web text containing those two words you can refine your search by adding key words. For example: kids’ crafts, papier mache. Or you might specify: kids crafts camping or kids crafts preschoolers.
The same keywords using a different search engine might well produce a different list because their data bases will all differ and the way they collected the data may also differ. More on this later.
Hope I've been able to help you understand the task of a search engine, but if you have any questions, just let me know and I'll be glad to answer them.:)
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