Amazon DynamoDB

Amazon S3 is a cloud storage service from Amazon Web Services. In the cited use, it stores an AWS Lambda application package when the package exceeds the size limit for direct deployment.

AWS Lambda is a cloud backend function used in the described system to connect an Alexa skill to an application.

Amazon Aurora is a managed relational database service from Amazon Web Services (AWS). In the cited discussion, it is described as a database for short-lived instances that agents can create and dispose of, with AWS rethinking the service for faster instance creation and disposal.

Amazon RDS is a hosted PostgreSQL database service from Amazon Web Services (AWS). In the cited architecture, it was used as the database for version one of a payments platform.