Infrastructure as Code (IaC) is a valuable practice for managing cloud infrastructure through code but can introduce security risks if not reviewed properly. Checkov, an open-source SAST tool by Bridgecrew, helps scan Terraform, Kubernetes, CloudFormation, and other IaC templates for security issues. By using Checkov to identify vulnerabilities like public access to S3 buckets in Terraform configurations, developers can proactively address security risks and enhance the security of their cloud infrastructure.