Many Cloud Computing and Hosting Providers do exist today, such as Amazon Web Services (AWS), Google Cloud Platform (GCP) and Microsoft Azure.
Here you can rent Cloud based services like Virtual Machines (Computers with OS running in the Cloud), Web Server, Database Systems, etc. based on a monthly fee.
You could say Microsoft Azure is "Windows running in the Cloud".
The Video below gives an Introduction to Microsoft Azure:
Students and staff at the univerity can get free (but limited) access to Microsoft Azure through the Microsoft Imagine subscription.
Below we see a practical example.
Cloud-based Data Logging, Monitoring and Analysis: