DevOps is more than just automation. It is a continuous process that involves planning, development, testing, automation and deployment. It means development and operations. DevOps is about culture, measurement, automation and sharing. It is a mindset towards creating efficient, consistent and collaborative workflows which can be deployed faster and can recover faster in case of any failure. Automation plays a significant role in this process but it can't be done without developing and understanding the underlying software. You should be clear about the differences between the two before choosing a DevOps tool, otherwise you might end up choosing the wrong one for the existing system.