PII refers to any information that can be used to identify an individual.
For example, age and physical address alone could identify who an individual is without explicitly disclosing their name, as these two factors are unique enough to typically identify a specific person.
In terms of space, individuals have an expectation that their physical spaces (i.e. Privacy within the realm of decision is best illustrated by the landmark case Roe v. Lastly, information privacy is in regards to the collection of user information from a variety of sources, which produces great discussion.
The 1997 Information Infrastructure Task Force (IITF) created under President Clinton defined information privacy as "an individual's claim to control the terms under which personal information--information identifiable to the individual--is acquired, disclosed, and used." At the end of the 1990s, with the rise of the internet, it became clear that the internet and companies would need to abide by new rules to protect individual's privacy.
Preventing or limiting the usage of Social Security numbers online, being wary and respectful of emails including spam messages, being mindful of personal financial details, creating and managing strong passwords, and intelligent web-browsing behaviours are recommended, among others.