A hybrid cloud is a cloud computing environment that enables the movement of data and applications between the public cloud and private cloud. Hybrid cloud provides businesses with more flexible and deployments options. If computing and processing demand fluctuates then the hybrid cloud allows the enterprise to deploy its on-premises infrastructure up to the public cloud to handle any overflow.
Hybrid helps the organizations to scale computing resources, eliminating the need to make a huge capital expenditure to handle temporary spikes in the demand.
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You can watch this video on Cloud Computing basics to understand more: