IAM User

The relationship between IAM-User and IAM-Group in Amazon Web Services (AWS) is that an IAM-User can be associated with one or more IAM-Groups, while an IAM-Group can contain multiple users. This relationship allows administrators to assign permissions to groups of users and manage them more efficiently than they would with individual users. By assigning roles to the group, the group's members inherit all of its permissions. The permissions assigned to a group are also inherited by any new members added later on. In addition, changes made to the permission set of a group take effect immediately for all members within it.