What is AWS Cognito used for here?

[kgoedecke]

Clearly the user are stored in dynamodb table here: https://github.com/danilop/LambdAuth/blob/master/LambdAuthCreateUser/index.js#L39

I was wondering what Cognito is used for here then, would be great if someone could clarify this: https://github.com/danilop/LambdAuth/blob/master/LambdAuthLogin/index.js#L61

[LucasBadico]

It issue the token, with secret keys and expiration management.