Accounts
AWS Accounts let you create, access, and manage cloud resources. Each account functions as a secure, isolated environment for running services, with its own billing and access controls. You can also link accounts using AWS Organisations, making it easier to manage multiple teams or departments from a central place, and consolidate your billing to keep everything streamlined.
IAM
AWS IAM or Identity and Access Management lets you securely control access to AWS resources. With IAM, you can create users, assign permissions, and set roles to control who can do what within your AWS account.