This document discusses serverless microservices using AWS Lambda and Node.js. It begins by explaining that AWS Lambda is a serverless computing platform that runs code without provisioning or managing servers. It then discusses how serverless architectures can be used to build microservices and outlines some of the pros and cons of AWS Lambda, including event-driven automatic scaling, on-demand pricing model, and resource limits. It concludes by providing examples of serverless use cases and architectures using AWS Lambda and other AWS services.