VPC Flow Logs is the correct AWS service that captures information about the IP traffic going to and from network interfaces in your VPC.

Key points about VPC Flow Logs:

• Captures network flow data for VPCs, subnets, and network interfaces
• Records source/destination IP addresses, ports, protocol, and traffic action (accept/reject)
• Helps with troubleshooting connectivity and security issues
• Can be published to Amazon CloudWatch Logs or Amazon S3

Why other options are incorrect:

• Amazon CloudWatch Logs: A log management service, but doesn't specifically capture network traffic flow data
• AWS CloudTrail: Records API calls and management events, not network traffic
• AWS IAM: Manages access control and permissions, not network traffic logging