AMI is nothing but Amazon Machine image and many times it can be used in processing that is based on Lambda conjunctions.
Basically, it is a template that mainly contains an application server, operating systems, and other applications.
It is also possible to create the cloud copy as it contains several instances and running multiple instances at a time.
The Amazon Machine image can also run a virtual server in the cloud computing platform.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/AMIs.html