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Identity and Access Management (IAM)

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Users, Groups, and Roles

IAM is the gatekeeper of AWS.

  • IAM User: Represents a person or service. It has permanent credentials (password or access keys).
  • IAM Group: A collection of users. You attach permissions to the Group (e.g., "Admins"), not the individual user, for easier management.
  • IAM Role: An identity without permanent credentials. It is "assumed" by a user or an AWS service for a short time. For example, an EC2 instance can assume a Role to get temporary permission to write to an S3 bucket.

Least Privilege: Always grant only the permissions necessary to perform a task and no more.