Identity and Access Management (IAM) defines who can do what on which resources
Although IAM for Google and AWS perform the same function, they do it in very different ways.
Google uses Service accounts to control service-to-service authentication; AWS uses IAM Roles and Profiles to accomplish this control.
Details are listed in the below table
| Concept | Google Cloud | Amazon Cloud |
| Programmic Identity | IAM service account | IAM role and instance profile |
| User Identity | Federated and managed outside IAM | Identify profiles within AWS and EC2 |
| Policy | List of binding for set of users by role | Documents based permission apply to cloud users |
| Permission Collection | User vs Role pairing | Managed policies |
| Predefined set of permission | Predefined roles | Managed policies |
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