What is meant by hybrid cloud?

Google provides a great definition of hybrid cloud.  "A hybrid cloud is a mixed computing environment where applications are run using a combination of computing, storage, and services in different environments—public clouds and private clouds, including on-premises data centers or “edge” locations. Hybrid cloud computing approaches are widespread because almost no one today relies entirely on a single public cloud."  Citation:  url 

However one of the underlying technologies is Kubernetes for which there is a curated version provided by Red Hat. 

Red Hat defines  Hybrid cloud as "a combination of at least 2 computing environments that share information with one another and run a uniform series of applications for a business or enterprise. Those environments may include:

• At least 1 private cloud and at least 1 public cloud

• 2 or more private clouds

• 2 or more public clouds

• One bare-metal (physical hardware) or virtual environment connected to at least 1 cloud

The term "cloud" describes a network of on-demand computing resources accessed over the internet. This ecosystem facilitates the delivery and exchange of computing services such as data storage, software applications, analytics, and intelligence tools. Source:  URL