AWS EventBridge is a serverless event bus service that allows you to listen to events from your applications, supported third-party applications, and AWS services. It simplifies building event-driven architectures by being the central event hub and allowing applications to publish, subscribe to, and react to events in near real-time. Building scalable and decoupled applications is becoming increasingly essential in modern software development. EventBridge process can be described in three steps: Step 1 - Event generation - An event source emits an event to an EventBridge Bus, or a scheduled rule is triggered. Step 2 - Matching event rules - Rules allow you to define conditions for matching events. For example, you might only want to act on events triggered by a specific AWS region or event type. The event will be matched to any event rules that were defined. This step also performs Input Transformation if defined in the rule, you can specify how to change the event using JSON paths that will extract information from the original event in a template you provide. Step 3 - Event delivery (Targets) - Matched events are sent to targets, which can be AWS services (e.g., Lambda, SQS, SNS) or HTTP endpoints via API destinations. It also has internal support for creating schedulers that emit events at a specific time. This enables developers to decouple their systems and build scalable asynchronous event-driven applications. EventBridge allows APIs to be called targets, public or private (inside VPCs). To enable an API Destination, you must create a connection so EventBridge knows how to authorize with the API. It supports three types of authentication: Basic, OAuth, and API Key. The best practices for Terraform and EventBridge integration include using module abstraction for EventBridge configuration, tagging everything for clarity, locking down IAM policies for EventBridge targets, using variables for environment-specific configurations, and always enabling Dead Letter Queues (DLQs). Spacelift is an IaC management platform that helps you implement DevOps best practices. It provides a dependable CI/CD layer for infrastructure tools including OpenTofu, Terraform, Pulumi, Kubernetes, Ansible, and more.