Rego
Rego is a declarative query language designed for writing policies, primarily used with the Open Policy Agent (OPA) framework. It allows developers to define rules and constraints over structured data, such as JSON or YAML, to enforce security, compliance, and authorization policies in cloud-native environments. Rego's syntax is inspired by Datalog and focuses on expressing complex logic in a clear, human-readable way.
Developers should learn Rego when building or managing systems that require fine-grained policy enforcement, such as Kubernetes admission control, API authorization, or infrastructure-as-code validation. It is particularly useful in microservices and cloud-native architectures where centralized policy management is needed to ensure security and compliance across distributed services. Rego enables writing reusable policies that can be evaluated against dynamic data without modifying application code.