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Kali Linux ™: An open-source distribution of Linux that is widely used in the security industry.

Kerberos: A system developed at the Massachusetts Institute of Technology that depends on passwords and symmetric cryptography (DES) to implement ticket-based, peer entity authentication service and access control service distributed in a client-server network environment.

Kernel: The essential center of a computer operating system, the core that provides basic services for all other parts of the operating system. A synonym is a nucleus. A kernel can be contrasted with a shell, the outermost part of an operating system that interacts with user commands. Kernel and shell are terms used more frequently in Unix and some other operating systems than in IBM mainframe systems. A Kernel is a component of the Linux OS that manages processes and memory.

Key-Value Pair: A set of data that represents two linked items: a key, and its kind of runnable code.