Infrastructure as Code (IaC) is a transformative process that replaces manual operations with automated resource provisioning, reducing errors and costs. Common tools like Chef, Puppet, and SaltStack often require existing infrastructure and can be complex to maintain. In transitioning to microservices and container orchestration, AWS leverages Terraform, cloud-init, Minimal Ubuntu, and Ansible for a streamlined IaC solution. Terraform facilitates resource provisioning within AWS, while Minimal Ubuntu offers efficient system deployment with enhanced security. Ansible, chosen for its simplicity and community support, handles configuration management without relying on a master server, using local playbooks instead. A practical implementation example includes creating a bastion host configured with Duo Multi-Factor Authentication (MFA) for SSH, using Terraform to manage AWS infrastructure and Ansible to configure host roles. This approach allows for flexible, scalable, and secure infrastructure management, adaptable to various environments and requirements.