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What is Terraform? 

Terraform is an open-source infrastructure as Code tool developed by HashiCorp. It is used to define and provision the complete infrastructure using an easy-to-learn declarative language. It is an infrastructure provisioning tool where you can store your cloud infrastructure setup as codes. DevOps Online Training 

Terraform Core concepts: DevOps Training

Below is the core concepts/terminologies used in Terraform:

Variables: Also used as input-variables, it is key-value pair used by Terraform modules to allow customization.

Provider: It is a plugin to interact with APIs of service and access its related resources.

Module: It is a folder with Terraform templates where all the configurations are defined

State: It consists of cached information about the infrastructure managed by Terraform and the related configurations.

Resources: It refers to a block of one or more infrastructure objects (compute instances, virtual networks, etc.), which are used in configuring and managing the infrastructure.

Data Source: It is implemented by providers to return information on external objects to terraform.

Output Values: These are return values of a terraform module that can be used by other configurations.

Plan: It is one of the stages where it determines what needs to be created, updated, or destroyed to move from real/current state of the infrastructure to the desired state.

Apply: It is one of the stages where it applies the changes real/current state of the infrastructure in order to move to the desired state.

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