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A search engine is a program which searches the various documents for specified keywords and gives a list of the documents where the keywords are matching. The search engine is only a general class of programs. However, in practice this phrase is used to describe searches made for documents on the World Wide Web.

When using this search term regarding the Internet, it is usually in reference to the actual forms that perform the search of the HTML document database that were originally compiled by a robot. There are three basic types of search engines: There are robot powered submissions, human based submissions, and some that are a combination of the 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 sends back all the data to a centralized reserve where the information gets indexed. The crawler goes back to the sites from time to time in order to confirm if any information has changed. The occurrence of this is established by those who administer the search 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since the web page became useless, the search engine still recognizes the page as an active link, even though it is no longer valid.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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Flash web designs provide visitors with a fully interactive multimedia experience. They are designed using fully integrated HTML, 3D graphics, and audio and video. This technology can be added to any web page, and allows the designers to design and create animations and interactive graphics.