In Prisma Cloud Compute, the scope of each rule within the host runtime policy is determined by the collection assigned to that rule. Collections in Prisma Cloud are logical groupings of resources, such as hosts, containers, or cloud accounts, that share common attributes or security requirements. By associating a rule with a specific collection, administrators can precisely define the context and applicability of the rule, ensuring that the runtime protection mechanisms are accurately targeted and effective. This approach enables granular control over security policies, allowing for tailored security measures that reflect the unique characteristics and needs of different resource groups within the multicloud environment.