IAM

• IAM stands for Identity and Access Management is a service that enables AWS customers to manage and access AWS resources.
• IAM focuses on RBAC method which allows admins to assign permissions to roles rather than users.
• IAM is also used to restrict users' permissions to perform only permitted tasks within their AWS account.

IAM security best practices:-

• Avoid using Root account.
• Use MFA to both root as well as IAM account.
• Rotate Access key regularly.
• Start using groups and give them permission.
• Give only required permission.
• Monitor permissions regularly.

AWS Cost optimization techniques:-

• Use right size of resources.
• Use Spot instance or reserved instances.
• Use CloudWatch.
• User server-less Architecture.

Disaster Recovery in multi cloud architecture:-