Blacklisting

Blacklisting is a security measure where a list of unwanted or untrusted entities—such as IP addresses, email addresses, or websites—is created to block their access or interaction with a system or network. When someone or something is blacklisted, they are prevented from sending messages, accessing resources, or engaging with the system. This helps protect against spam, malware, or malicious actors by proactively denying entry based on known malicious activity or reputation. Blacklisting is a common tool in cybersecurity to enhance safety and control over digital interactions.