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A blacklist is a list of people or other entities who are to be denied a particular service, access, or recognition. The exact definition varies depending on the context in which it is used.
Computing
In computer systems, a blacklist is an access control system that denies a list of users, websites, or programs permission to access specific data, or prevents them from being accessed themselves.
Medical
In a medical context, a blacklist is a number of people who are denied medical care by multiple physicians, generally because the persons in question are known to be problem patients, or have previously filed a suit against a doctor.
Politics
Politically, a blacklist is made up of those who have been denied access to something, generally because of the prejudices or opinions of another group. Such a list, together with a medical blacklist, is more likely to be theoretical rather than physical in nature.
Retail
Many stores in the United States have a policy of refusing service to those who excessively return products previously purchased. This is known as a retail blacklist.
Differentiated from a Boycott
A blacklist is usually the efforts of a third party to prevent the interaction of, or a transaction between, two others. A boycott, on the other hand, is the decision of a direct party to such an interaction refusing to participate.
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