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What IAM Actually Is

AWS Identity and Access Management (IAM) helps control who can access AWS resources and what actions they are allowed to perform. It provides users, roles, permissions, and policies to manage access securely.

Varshitha

AWS IAM – A Simple Introduction
Identity and Access Management (IAM) is an AWS service used to manage access and permissions for AWS resources. It helps decide who can access AWS resources, what they can access, and what actions they can perform.
For example, if an AWS account has several users, you may want one person to manage EC2 servers while another person can only view S3 storage. IAM allows you to create these different permissions.
  1. IAM Users
    An IAM user represents a person or application that needs access to AWS resources. Each user can have specific permissions.
  2. IAM Groups
    A group is a collection of IAM users. Instead of giving permissions to each user separately, permissions can be assigned to a group.
    For example:
    Developers → permissions for development resources
    Administrators → broader management permissions
    Viewers → read-only access
  3. IAM Policies
    A policy is a document that defines what actions are allowed or denied.
    For example, a policy can allow a user to:
    View an S3 bucket
    Start or stop an EC2 instance
    Read data from a particular resource
  4. IAM Roles
    An IAM role provides temporary permissions that can be assumed by users, applications, or AWS services. Roles are commonly used when an application needs permission to access another AWS service.
  5. Authentication and Authorization
    IAM helps with two important concepts:
    Authentication:
    “Who are you?”
    Authorization:
    “What are you allowed to do?”
    For example, logging into AWS verifies your identity, while IAM permissions determine whether you can create an EC2 instance.
  6. Why IAM is Important
    IAM helps organizations follow the principle of least privilege, which means giving users only the permissions they actually need.
    This can help:
    Protect AWS resources
    Reduce unauthorized access
    Manage permissions
    Improve cloud security
    Control access for users and applications
  7. Multi-Factor Authentication (MFA)
    MFA adds an extra layer of security to an AWS account. Instead of using only a password, MFA requires an additional verification method when signing in.
    For example:
    Password + MFA code = Access
    Even if someone knows the password, they still need the additional verification method to access the account.
    Types of MFA
    Authenticator App
    An authenticator app generates a temporary code that can be entered during sign-in.
    Security Key
    A physical security device is used to verify your identity.
    Passkey
    A passkey uses security features of your device, such as biometrics or a device PIN, for authentication.
    Why MFA is Important
    Provides an extra layer of security.
    Helps protect AWS accounts from unauthorized access.
    Makes account login safer than using a password alone.
    Conclusion
    IAM is one of the important foundations of AWS security. Understanding users, groups, policies, roles, authentication, authorization, and MFA helps us understand how access to cloud resources is controlled.
    Simple way to remember:
    IAM = Who can access what, and what they can do. 🔐☁️
    MFA = An extra verification step for safer access.
Any opinions in this article are those of the individual author and may not reflect the opinions of AWS.
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