kubernetes/docs/user-guide/security-context.md

PLEASE NOTE: This document applies to the HEAD of the source tree only. If you are using a released version of Kubernetes, you almost certainly want the docs that go with that version.

Documentation for specific releases can be found at releases.k8s.io.

Security Contexts

A security context defines the operating system security settings (uid, gid, capabilities, SELinux role, etc..) applied to a container. See security context design for more details.