Application Release Orchestration (ARO) is a set of practices and tools used to manage and coordinate the deployment of software applications across various environments, including development, testing, staging, and production. ARO enables organizations to release software quickly, efficiently, and with minimal risk, by automating the processes involved in building, testing, and deploying applications.

ARO involves the coordination of multiple teams, processes, and technologies involved in software delivery, such as developers, testers, operations, and release managers. It also includes the automation of various tasks such as version control, build management, configuration management, testing, deployment, and monitoring.

ARO tools typically provide a central dashboard for managing the entire software delivery process, allowing teams to track progress, collaborate on tasks, and identify and resolve issues quickly. Some of the popular ARO tools include Jenkins, GitLab, IBM UrbanCode, Microsoft Azure DevOps, and Atlassian Bamboo.

In summary, ARO is a methodology that enables organizations to automate and streamline their software delivery processes, reducing the time and effort required to deploy new applications and updates while improving quality and reducing the risk of errors.