https://www.techradar.com/news/what-is-cloud-orchestration

Cloud computing remains a powerful technology which enables computing over the internet. Enterprises use it frequently to lower their capital costs, and day-to-day expenses, while enabling online powerful applications, such as Software as a Service or Unified Communications as a Service. Cloud computing has become essential with over 25% of US and European enterprises using public clouds currently, which is predicted to increase to 44% by 2021. Organizations often use a combination of public cloud, and private cloud solutions in what is termed hybrid cloud, and commonly have more than one cloud provider, which is known as multicloud.

With so many types of cloud computing in use simultaneously across an organization, there is quite a bit of complexity, and the potential for these clouds to turn into a storm, with data as well as applications in use across multiple cloud solutions. Cloud orchestration is the process to manage these multiple workloads, in an automated fashion, across several cloud solutions, with the goal being to synthesize this into a single workflow. Just like the challenge of an orchestra is to get the all instruments to perform the same piece together, this makes cloud orchestration like the musical conductor that controls the performance and keeps it in sync. This can be quite challenging as cloud orchestration involves heterogeneous systems, across both public and private cloud solutions, which as they are often geographically separated requires managing the network that connects them as well.