Terraform is a core principle in DevOps, focused on infrastructure as code (IaC), enabling the provisioning and management of infrastructure across multiple platforms. It uses HCL (HashiCorp Configuration Language) to automate cloud infrastructure setup. Terraform keeps infrastructure aligned with code using state files, promoting code reuse and scalable deployments. Hosting Terraform code in a repo supports version control and teamwork, integrating well with CI/CD pipelines. Jenkins is an open-source automation tool designed for simplifying application deployment using CI/CD workflows, automating building, testing, and deployment across platforms like AWS, Azure, Google Cloud, and Kubernetes. Jenkins pipelines are written in Groovy and define each stage of development, enabling continuous integration and delivery with minimal manual work. Terraform and Jenkins serve different purposes in DevOps workflows: Terraform handles infrastructure lifecycle (create, update, destroy), while Jenkins handles software lifecycle (build, test, release). They can be used together to create a powerful, automated workflow that unifies infrastructure management and software delivery, boosting efficiency and reducing manual errors. Spacelift is an IaC management platform that helps implement DevOps best practices, providing a dependable CI/CD layer for infrastructure tools like OpenTofu, Terraform, Pulumi, Kubernetes, Ansible, and more.