AWS Organizations is used to manage multiply AWS account.

Let me show you an example.

Let’s say we have a Master account and a sub-account.

Invite new account to your organization

Login the master account and choose AWS Organizations service.

Add a new account to your Organization by clicking the Add account button.

The account you invited should receive a notification and if accept the invitation you could see one more account in your organization.

Now we have 2 accounts in our organization.