“The existence of multiple clients sharing resources (services or applications) on distinct physical hardware. Due to the on-demand nature of the cloud, most services are multi-tenant. When you use software like Trello, a popular task tracking tool, your account and settings are shared on a network that is also being used by millions of other users. Even though you can only see your own data, due to multi-tenancy, Trello is able to achieve economies of scale by being able to host everyone’s data together, but isolating them such that data is private only to you. This is a fundamental aspect of SaaS products, which are enabled by cloud technologies, ie. hosting databases and storage in the public cloud.”

What do we mean by this?

The cloud version of an apartment building—one building, many tenants.