IAM
IAM is the AWS Identity and Access Management service that enables you to manage users, groups, and roles in your AWS account. It is a centralized control point that manages access to your AWS resources.
EC2
EC2 is the AWS Elastic Compute Cloud service that provides resizable compute capacity in the AWS cloud. It enables you to launch virtual machines (VMs) in the AWS cloud, and configure them with the software you need to run your applications. EC2 Instance Types See al list of EC2 instances and comparisons