The aspect of an operating system that ensures resources are used only in ways that satisfy predetermined policies is **Access control**.
Access control in an operating system regulates which users or system processes have access to resources, and what actions they can perform on those resources. It enforces security policies by determining who can access specific resources, like files, folders, or devices, and what operations they are allowed to do.
For example, access control can be configured to allow only certain users to read, write, or execute a file, thus preventing unauthorized users from accessing or modifying sensitive information. It helps in maintaining the integrity and security of the system by ensuring that resources are utilized in accordance with established rules and permissions.
