AWS Certified Cloud Practitioner

IAM Roles are the correct choice for secure communication between EC2 instances and AWS services like S3. Here's why:

• IAM Roles provide temporary security credentials that are dynamically created and rotated automatically
• They are designed specifically for AWS services (like EC2) to assume and access other AWS services
• No long-term credentials (passwords or access keys) are stored on the EC2 instance
• When an EC2 instance assumes a role, it gets temporary security tokens that expire after a set period
• This is more secure than using IAM Users with permanent credentials

Why not the other options:

• IAM Users: Use permanent credentials which are less secure and harder to manage
• IAM Groups: Are for organizing users, not for service-to-service communication
• IAM Policies: Define permissions but don't provide the credential mechanism themselves

For production environments, IAM Roles provide the most secure and manageable solution for EC2 instances to interact with other AWS services.