Final answer:
Each policy definition in Azure Policy is designed to have a single effect, which determines the behavior when policy rules are matched with resources, maintaining clarity in Azure Governance.
Step-by-step explanation:
Each policy definition in Azure Policy has a single effect. Azure Policy definitions enforce different behaviors in the evaluation of resources in Azure. These effects determine what happens when a policy rule is matched with existing resources or when resources are being created. Common effects include Audit, Deny, Append, DeployIfNotExists, among others, but each policy definition can only have one effect. This ensures clarity and precision for policy definitions applied within Azure Governance.