blacklistswhitelists
Blacklists and whitelists are policy mechanisms used to control access or filter content by listing items that are either forbidden or permitted. They are applied in many contexts, including email filtering, network security, and application access control, and are often part of broader information-security or governance frameworks.
A blacklist is a list of entities deemed undesirable and blocked by default. It can target IP
A whitelist is a list of entities that are explicitly allowed. Access or content is permitted only
In practice, organizations often employ hybrid approaches that combine allow and deny lists with broader policy