# IAM - Manage Users, Roles and Permissions
With IAM service you can specify who can access which services and resources
▪ Create and manage AWS Users and Groups
▪ Assign policies (set of permissions)
### Different Types of IAM Users
▪ Human Users
▪ System Users: For example Jenkins needs permission to deploy Docker containers on AWS
### Groups
▪ For granting access to multiple IAM users
### IAM roles
▪ IAM role is similar to an IAM user
▪ Instead of being uniquely associated with one person, a role is intended to be assumable by anyone who needs it
▪ Also Policies cannot be assigned to AWS services directly
▪ So role is used to grant AWS services access to other AWS services
{% hint style="info" %} **How to attach policies to IAM Role?**
1. Create IAM Role
2. Assign Role to AWS Service
3. Attach Policies to that IAM Role
{% endhint %}
 
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