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A hybrid cloud is what you get when you connect multiple cloud infrastructures that may or may not be of the same type (public, private, or community). For example, a dentist's office may use the public cloud for its email and office applications but also connect to a community cloud shared by other dentists to access an application for storing patient records. Figure 1.13 shows examples of hybrid computing.

FIGURE 1.13 Hybrid cloud

When you use multiple cloud providers redundantly, it's called a multicloud deployment. Multicloud deployments are common when there's a need to avoid the unlikely failure of an entire provider, or to avoid cloud provider lock-in.

Colloquially, a hybrid cloud may also refer to connecting cloud-based resources to a data center or office. Although technically this isn't a hybrid cloud, understand that this is actually what most people mean when they use the term.