How can we use Virtual Hardware in an EC2?

Which Tenancy is called as Multi Tenant Model?

Shared Tenancy

The main difference between Dedicated Host and Dedicated Tenancy?

In Dedicated Host we will have full visibility of the physical hardware and we will use our license, wheras in dedicated instance, the physical hardware / infrastructure is managed by AWS.

What is a placement group in AWS?

It is a physical placement of EC2 instance inside a data center.

If AWS terminates the spot instance, does the data get lost or saved by AWS?

We need to take a backup of the data, during the 2min warning provided by AWS before interruption, else the data will be lost