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AWS IAM Policies function by defining a set of permissions for actions on AWS resources. These policies are critical in governing what actions a user or group of users can perform on specific AWS services and resources. Each policy is written in JSON format and specifies which actions are allowed or denied, along with the resources these actions can be applied to.

Policies can be attached to IAM users, groups, or roles, providing fine-grained access control. This means that you can specify not just what actions can be taken, but also under what conditions they can be taken, such as IP address restrictions, time of day, or whether the request comes from a specific AWS service. This flexibility is central to managing security and governance in an AWS environment.

The other options do not accurately describe the core functionality of IAM Policies. While auditing tools and user account management are important aspects of AWS's security and management strategies, they do not directly involve IAM Policies themselves. Similarly, encryption keys relate to data security but are not the function of IAM Policies, which are solely focused on access control permissions.