http://en.wikipedia.org/wiki/Personally_identifiable_informa...
In information security and privacy, PII is any piece of information which can potentially be used to uniquely identify, contact, or locate a single person. Whilst the acronym PII is commonly used, there is no common or agreed use of the words from which it is created. Common variants are personal identifiable information, personally identifiable information, personal identifying information and personally identifying information. One can even find personal identified information in Google.

Although the concept of PII is ancient, it has become much more important as information technology and the Internet have made it easier to collect PII, leading to a profitable market in collecting and reselling PII. PII can also be exploited by criminals to stalk or steal the identity of a person, or to plan a person's murder or robbery, among other crimes. As a response to these threats, many web site privacy policies specifically address the collection of PII, and lawmakers have enacted a series of legislation to limit the distribution and accessibility of PII.



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