What is IAM? Users, roles, policies in one minute.

IAM

For What is IAM? Users, roles, policies in one minute., interviewers listen for a crisp definition, how the pieces interact in a real system, and one trade-off or failure mode you have seen or would guard against.

• Users/roles: identity (humans vs workloads).
• Policies: JSON allow/deny on actions/resources.
• Least privilege—Lambda execution role only needs s3:GetObject on one bucket.