What is AWS IAM?

AWS Identity and Access Management (IAM) is a web service that helps you securely control access to AWS resources. It enables you to manage users, groups, roles, and their permissions to access AWS services. IAM provides fine-grained access control across all of AWS, allowing you to specify who can access which services and resources. It supports multi-factor authentication (MFA), identity federation, and temporary credentials. IAM is essential for implementing the principle of least privilege and maintaining security in AWS environments.