Explanation
Terraform relies on plugins called "providers" to interact with cloud providers, SaaS providers, and other
APIs, as per: https://www.terraform.io/language/providers

Explanation
A local path must begin with either ./ or ../ to indicate that a local path is intended, to distinguish from a
module registry address.
module "consul" {
source = "./consul"
}

Reference:
https://www.google.com/search?q=Write+a+Terraform+configuration%2C+run+terraform+init%2C
+run+terraform+plan+to+view+planned+infrastructure+changes%2C+and+terraform+apply+to+create+new
+infrastructure.&oq=Write+a+Terraform+configuration%2C+run+terraform+init%2C+run+terraform+plan+to
+view+planned+infrastructure+changes%2C+and+terraform+apply+to+create+new
+infrastructure.&aqs=chrome..69i57.556j0j7&sourceid=chrome&ie=UTF-8

Explanation
https://www.terraform.io/language/files/dependency-lock
"hcl , and this name is intended to signify that it is a lock file for various items that Terraform caches in the .
terraform subdirectory of your working directory. Terraform automatically creates or updates the dependency
lock file each time you run the terraform init command."

Explanation
Terraform supports both HashiCorp Configuration Language (HCL) and JSON formats for configurations.
https://www.terraform.io/docs/configuration/