# Reference

Detailed technical specifications for Trilio for Kubernetes (T4K) resources, APIs, and runtime behavior. Use this section when you need exact schemas, field definitions, or capability requirements.

## Custom Resource Definitions

T4K extends Kubernetes with its own CRDs. These define the schema and API for T4K objects you interact with via `kubectl` or the CLI.

* [**Application CRD**](/kubernetes/reference/custom-resource-definition-application.md) — API reference for the T4K Application custom resource, including all fields and accepted values.
* [**Operator CRD**](/kubernetes/reference/custom-resource-definition-operator.md) — API specification for the T4K upstream Operator custom resource.

## Pod and Job Capabilities

* [**T4K Pod/Job Capabilities**](/kubernetes/reference/tvk-pod-job-capabilities.md) — The Linux capabilities and security context settings required by T4K pods and jobs. Useful when configuring Pod Security Admission, OPA policies, or restrictive cluster security profiles.


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