Why you need AWS I AM Identity Centre.

AWS I AM identity centre

formerly known as AWS SSO is a centralized, one stop centre where access is managed for AWS accounts and application.
I AM which is Identity Access Management holds a pivotal place in cloud computing and in Aws resources because functionality of resources and architecture.
IAM basically provides authentication on a granular level resource by resource in the AWS environment. It gives flexibility and creativity on how you design ,tailor accessibility and permissions.
As interesting as this may sound, the limitation is that you have to grant permission to an account by account basis.
The Well Architected Framework was a way out of this otherwise cumbersome task in helping to build scalable designs.

AWS Single Sign-On (AWS SSO)

—is an expression of IAM, built on its structure to provide centralized access management to across AWS accounts. The need was further enforced by and through customers use and adoption of multi-account AWS environments made AWS decide to provide the service.

I AM identity center is free and it helps in simplifying access to the aws environment with multiple accounts.Although the AWS IAM center formerly known as AWS Single Sign on(AWS SSO) was used for multi -account

I AM IDENTITY CENTER helps you connect to your existing workforce directory, create users in one place to use across aws services.
The youtube video below explains more
https://youtu.be/4yJp5-jGGNk
I am identity center can do the following:

1.Enable multi-account access to your AWS accounts.
2.Enable single sign-on access to your AWS applications.
3.Enable single sign-on access to Amazon EC2 Windows instances.
4.Enable single sign-on access to cloud-based applications.