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1. Information technology - cybersecurity.

A code that is used to encrypt messages or other information, or to convert encrypted information back into normal text - or other normal information.

2. Security - security systems.

A physical device that allows access to secured - or confidential - parts of a physical or virtual environment.

Physical keys may incorporate electronic components.

3. Adjective.

Of high importance, to focus on.

For example, a Key Performance Indicator (KPI).

See also