Metacrawlers - College Research
Metacrawlers and metasearch tools don’t crawl the web and build indexes like search engines. Instead, they send searches out to multiple search engines at the same time and compile the results for you. These tools are great for testing out your search keywords and gathering more information to continue searching.
Web databases are considered “invisible” because the information they contain is not searchable by typical web search engines and crawlers. That is because these tools are databases NOT web pages and sites. However, they are rich in information and should not be overlooked.
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