What is meant by Virtual machine?

A virtual machine is a computer inside another computer.

Advantages of cloud computing?

Cost saving, Scalability, Accessibility, Backup & recovery, High performance

What are the basics needs to access cloud services?

To access cloud services, we need:

Internet connection
A device (computer, phone, etc.)
An account with a cloud provider like Amazon Web Services or Google Cloud
Login details (username & password)
Basic knowledge to use the services

what is client OS?

Advantage of cloud computing