The following graphic and table explain the basic flow for using Amazon EC2.
Launch Confirmation Process
1
You create an AMI from scratch or based on an existing AMI. This is optional, as you can
launch instances of existing AMIs without modifying them.
See Creating an AMI.
2
You bundle the AMI and obtain an AMI ID so you can launch as many instances of the AMI as you want.
See Bundling an AMI.