This document discusses Docker Containers as a Service (CaaS). It begins by showing how Docker aims to build tools for mass innovation by creating a software layer to program the internet across various hardware and applications. It then discusses how CaaS provides an IT-managed secure environment for developers to build and deploy applications. Finally, it outlines the key characteristics of Docker's CaaS platform which supports the full application lifecycle across languages, operating systems and infrastructures through open APIs and ecosystem support.