Search Engines - Get Information On The World Wide Web
A program that looks through documents for specific keywords and then provides a list of the ones that contain those words is known as a search engine. Even though a search engine refers to a broad group of programs, the term is frequently used to describe methods allowing users to locate documents on the Internet.
When people use the term search engine in relation to the Internet, they are usually referring to the actual search forms that search through databases of HTML documents, initially gathered by a robot. There are basically three types of search engines: Those that are powered by robots and those that are powered by human submissions; and those that are a hybrid of these two.
Search engines that are crawler-based are ones that generally make use of automatic software agents known as crawlers that go to web sites, read the data on the site, read the Meta tags and follow the links connected to the site in order to index every site that links to it.
The crawler returns all that information back to a central or main depository, where the data is indexed. The crawler will periodically return to the sites to verify for any information that has changed. The frequency with which this happens is determined by the administrators of the engine.
Another category of search engines are the ones that are powered by humans who submit information. This information is then indexed, ensuring that only information that is specifically put forward is entered into the index. In either case, it's this index that the search engine has created that you are consulting when you try to find information through a search engine query.
This suggests that you're not really looking on the Internet. These databases contain an enormous amount of information that is gathered, stored and then searched. This accounts for receiving dead links when performing a search using a commercial search engine. The results of the search are established by an index. If the index hasn't been brought up to date since the web page became useless, the search engine still recognizes the page as an active link, even though it is no longer valid. It will stay like this until the index gets updated.
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A search engine is a program used for looking up documents on the internet containing specified keywords. There are three kinds of search engines - robot-powered, human-powered, and a hybrid of the two. A crawler-based search engine uses automated software agents that visit the site, read information in it, and return data to a depository for indexing. A human-powered search engine relies on humans to submit such information. Searching the internet really means searching from a database of information that is collected, indexed and continually updated. Web design software for an entrepreneur is necessary to boost sales. Flash web design provides an interactive experience for anyone who visits the site.
Published May 4th, 2008
Filed in Ecommerce, Internet, Web Design, Web Hosting
