Google hacking is the use of a search engine, such as Google, to locate a security vulnerability on the Internet. There are generally two types of vulnerabilities to be found on the Web: software vulnerabilities and misconfigurations.
Although there are some sophisticated intruders who target a specific system and try to discover vulnerabilities that will allow them access, the vast majority of intruders start out with a specific software vulnerability or common user misconfiguration that they already know how to exploit, and simply try to find or scan for systems that have this vulnerability. Google is of limited use to the first attacker, but invaluable to the second. Google hacking - a Whatis.com definition
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