You could treat your cloud like a data center full of servers with system administrators cracking the whip over them. But that would be wrong.
It would also technically and financially foolish. To get the most from your cloud, you need to get not just your administrators, a.k.a. operators, thinking in different ways, but your developers as well. With clouds, they must learn to — oh, the horror!
Hence, DevOps, the portmanteau of development and operations.