API
GraphQL API
AWS AppSync helps you build data-driven apps with real-time and offline capabilities. The AppSync Android SDK enables you to integrate your app with the AWS AppSync service and is based off of the Apollo project found here.
REST API
The API category will perform SDK code generation which, when used with the AWSMobileClient, can be used for creating signed requests for Amazon API Gateway when the service Authorization is set to AWS_IAM or when using a Cognito User Pools Authorizer.