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Glossary of terms and definitions for IT (Information Technology), the Internet and cyber security.
This glossary provides more than 480 clear and concise definitions of commonly used terms in the fields of information technology, the internet, and cyber security. It is designed to support users of all levels in understanding key concepts, technical jargon, and acronyms frequently encountered across digital platforms and security-related discussions. Whether you are a business owner, student, professional, or simply interested in the digital landscape, this resource aims to enhance your knowledge and confidence in navigating the ever-evolving world of technology.
A security strategy where specific applications, users, IP addresses, or processes that are known to be malicious or unauthorised are explicitly blocked from accessing a system, network, or resource. Everything not included on the blacklist is allowed by default, but may still be monitored for suspicious activity.
Example: A web server's firewall blacklists IP addresses associated with repeated unauthorised login attempts to prevent further access.
See also: Whitelisting
A security strategy where only explicitly approved applications, users, IP addresses, or processes are allowed access to a system, network, or resource. Everything not included on the whitelist is automatically blocked by default, reducing the attack surface and limiting potential threats.
Example: A company's IT department whitelists specific software applications on employee computers, ensuring that only approved programs can run on the network.
See also: Blacklisting