Shodan: The Hacker's Search Engine
A web search engine is a software system that's designed to search for information on the World Wide Web. As we all know, the information we usually get through search engines (like Google, Yahoo. or Bing) is a mix of web pages, images and other types of files.
Some search engines also mine data in databases or open directories. I will not address in detail how the search engines work, since it's a vastly complex subject, but they all maintain the following processes in near real time:
1. Web crawling
2. Indexing
3. Searching
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