CAMS is an acronym describing DevOps core values.
C stands for culture.
A stands for automation.
M stands for measurement.
S stands for sharing.
There are variants on the CAMS model:
CALMS, where L stands for lean flow. This variant is for instance used by Atlassian: DevOps: Breaking the Development-Operations barrier
CALMR, where R stands for recovery. This variant is for instance used by the Scaled Agile Framework when talking about DevOps.