Explain the steps required to load and integrate a resource into the infrastructure using Terraform.

To load and integrate a resource into the infrastructure using Terraform, the following steps are necessary:

1. Defining the resource in the configuration — in a .tf file, describe the required resource, such as a virtual machine, network, or database, with all necessary parameters.

2. Initializing Terraform — the command terraform init downloads the necessary providers and modules, preparing the working directory.

3. Planning changes — the command terraform plan shows what changes will be made to the infrastructure based on the configuration.

4. Applying changes — the command terraform apply creates or updates resources in the cloud or local infrastructure according to the description.

5. Checking and managing state — Terraform stores the infrastructure state in the terraform.tfstate file, which allows tracking current resources and their parameters.

Example of an AWS EC2 resource description:

provider "aws" {
  region = "us-west-2"
}

resource "aws_instance" "example" {
  ami           = "ami-0c55b159cbfafe1f0"
  instance_type = "t2.micro"
}

Thus, Terraform allows declarative description of infrastructure and management of its state through a sequence of commands.