AWS Cognito is Amazon's sign on and authentication service. It lets you create sign ons and control the access level to the AWS resources.
AWS Cognito lets you create User Pools or Identity Pools
Here are the various Congito items in Visual Studio
Here we can create the user sign ups for used in Apps
Here we can create sign ups for use on other AS services. And we can also use other Public Authentication services, such as those provided by Facebook or Google+
For more information on AWS Cognito Please Visit Here