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There may be any combination of cloud services when to deploy a hybrid cloud. It may the client has its own on-premise private cloud as IaaS and leverage public cloud as SaaS. Private cloud may be on premise or sometimes off premise on a dedicated server [10]. There is no fixed fits for all architecture. Private clouds can be made individually, whereas public cloud can be hired from vendors like Amazon, Microsoft, Alibaba, Google, and IBM. Next, a middleware is required to combine public and private cloud mostly provided by the cloud vendors as a part of their package. Figure 1.1 gives general diagram of a hybrid cloud.

In case of hybrid cloud architecture, the following is a list of properties that must to be kept in mind [4]:

1 a. Multiple devices need to be connected via LAN, WAN, or VPN with a common middleware that provides an API for user services. Rather than using a vast network of API, a single operating system must be used throughout the network and APIs can be built on top of that.

2 b. Resources are made available to all the connected devices via virtualization and it can be scaled up to any limit.

3 c. The middleware does all the coordination between devices and resources are made available on demand basis with proper authentication.