Cloud Composer is a

A fully managed machine learning service provides developers and data scientists with the ability to build, train, and deploy machine learning (ML) models quickly. [Source: AWS]

Workflow orchestration empowers you to author, schedule, and monitor pipelines that span across clouds and on-premises data centers. [Source: Azure]

service that empowers you to author, schedule, and monitor pipelines that span across clouds and on-premises data centers. Built on the popular Apache Airflow open source project and operated using the Python programming language, Cloud Composer is free from lock-in and easy to use.