Terraform is an Infrastructure as Code (IaC) tool that allows the DevOps engineer to automate the provision and management of infrastructure resources. It uses configuration files written in HashiCorp Config Language (HCL) to define the desired state of the infrastructure and has various commands to configure and apply the infra resources. 

GitHub Actions is a continuous integration and delivery platform (CI/CD) that allows developers to automate build, test, and deployment pipelines. During the deployment configuration, we need to define a step: a step is an individual action that GitHub Actions performs.