It’s easy to confuse virtualization and cloud computing. Both create environments from abstract resources. Virtualization allows the creation of multiple environments and or dedicated resources from a single, physical hardware system. Cloud computing are environments that abstract, pool, and share scalable resources across a network. Simply put, virtualization is a technology, where cloud computing is an environment. 

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Cloud infrastructure can include a variety of bare-metal, virtualization, or container software that can be used to abstract, pool, and share scalable resources across a network to create a cloud. Cloud computing is a stable. This gives users independence across public, private, and hybrid environments.

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Virtualization can then be used to create clouds. To be clear. It is not the only option for cloud Computing.

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Virtualization have software called hypervisors.  A hypervisor sits on top of physical hardware and abstracts the machine's resources, which are made available to the virtual environments to create virtual machines. These resources can be raw processing power, storage, or cloud-based applications containing all the resources required to run and deploy virtual machines.

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Virtual resources need to be allocated into pools before they're called cloud computing. Adding a layer of management gives control over the infrastructure, platforms, applications, and data that will be used in the cloud computing. Automation is added to provide the self-service components and reduce administrative interaction. By adding automation repeatable instructions and processes can provide seemless configuration.

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Virtualization can make a resource act like many, while cloud computing acts as a single pool of automatically provisioned resources.