(1) A list of email addresses or domains of known spammers. See
spam,
spam filter,
Blacklist of Internet Advertisers,
greylisting and
blackholing. Contrast with
whitelist.
(2) A list of websites that are considered off limits or dangerous. A website can be placed on a blacklist because it is a fraudulent operation or because it exploits browser vulnerabilities to send spyware and other unwanted software to the user. Contrast with
whitelist.
(3) A list of applications that a user is forbidden to run in an organization. Maintained by the system or network administrator, software in the user's computer prevents them from installing or running any program in the blacklist. Contrast with
whitelist.