AWS Identity and Access Management (IAM) is a web service that enables Amazon Web Services (AWS) customers to manage users and user permissions in AWS. The service is targeted at organizations with multiple users or systems in the cloud that use AWS products such as Amazon EC2, Amazon SimpleDB, and the AWS Management Console. With IAM, you can centrally manage users, security credentials such as access keys, and permissions that control which AWS resources users can access.

IAM User Guide
Introduces you to AWS Identity and Access Management, helps you set up users and groups, and shows you how to protect your resources with access control policies. Also shows how to connect to other identity services to grant external users access to your AWS resources.
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IAM section of AWS CLI Reference
Describes the AWS CLI commands that you can use to administer IAM. Provides syntax, options, and usage examples for each command.
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IAM API Reference

Describes all the API operations for AWS Identity and Access Management in detail. Also provides sample requests, responses, and errors for the supported web services protocols.
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STS section of the AWS CLI Reference
Describes the AWS CLI commands that you can use to generate temporary security credentials. Provides syntax, options, and usage examples for each command.
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STS API Reference
Describes all the API operations for AWS STS in detail. Also provides sample requests, responses, and errors for the supported web services protocols.
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