This document discusses how to build an app on AWS for the first 10 million users. It covers key expectations for modern applications like high availability, scalability, and fault tolerance. It then describes various AWS services that can help achieve these expectations, such as Elastic Beanstalk for deployment, RDS or DynamoDB for databases, S3 for storage, API Gateway and Lambda for serverless architectures, and CloudFront for content delivery. The document includes live demos of building web and mobile apps using these AWS services.