What command is primarily used to create or update infrastructure in Terraform?

The command that is primarily used to create or update infrastructure in Terraform is "terraform apply." This command takes the changes specified in the Terraform configuration files and applies them to the target infrastructure. When you run "terraform apply," Terraform first checks the current state of the infrastructure against the desired state defined in the configuration and then makes any necessary adjustments to bring the infrastructure in line with that desired state.

The process involves executing the planned actions, which could include creating resources like virtual machines, updating existing configurations, or even deleting resources that are no longer needed, depending on the changes made in the configuration. It is an essential part of the Terraform workflow, as it is the step where actual modifications to the infrastructure happen.

While other commands like "terraform plan" are important in the workflow for previewing changes before applying them, "terraform destroy" is used to remove infrastructure entirely, and "terraform init" prepares the working directory for other commands, they do not directly perform the creation or updating of infrastructure. Therefore, "terraform apply" is the key command for making actual changes to your infrastructure within Terraform.