When you deploy Azure API Management with the default configuration for virtual networking, your instance will not be deployed into a virtual network (VNET), and thus be fully accessible from the Internet. This is a great way to share your public APIs with the world.
There are other use cases where you might not want to or can expose your APIs publicly and where you need to share your APIs with external partners or internal users only. You might have web APIs on-premises and want to expose them in Azure API Management in a ...