Create 10 practical approaches on how developers and DevOps teams can optimize cloud infrastructure costs through the targeted use of Infrastructure as Code (IaC) to use resources more efficiently and avoid budget overruns.

Context: [Cloud Computing, Infrastructure as Code, IaC, Cost Optimization, AWS, Azure, Google Cloud, Terraform, CloudFormation, Resource Management, Automation, Scaling, Monitoring]

Goal: [Reducing unnecessary costs in cloud environments, Automated management and adjustment of infrastructure, better transparency and control over resources, optimization of scaling strategies]

For each approach explain:
1) the specific application or technique in the context of IaC for cost optimization
2) example configurations or code snippets (e.g. Terraform modules, CloudFormation templates)
3) notes on advantages, possible risks, and best practices

The approaches should:
- consider various cloud providers and IaC tools
- address common cost drivers such as unused resources, overprovisioning, or lack of scaling
- include practical automation steps and monitoring strategies
- be suitable for users with basic to intermediate knowledge in cloud and IaC