Answer: AWS Lambda

## Explanation AWS Lambda is the correct answer because: - **Serverless Architecture**: AWS Lambda is a serverless compute service that automatically scales resources up or down based on the number of incoming requests or events - **Automatic Scaling**: Lambda functions automatically scale from zero to thousands of parallel executions without any manual intervention - **No Operational Overhead**: Unlike Amazon EC2 which requires manual configuration of Auto Scaling Groups, Lambda handles scaling automatically - **Event-Driven**: Lambda scales in response to triggers from various AWS services like API Gateway, S3, DynamoDB, etc. **Why other options are incorrect:** - **Amazon SQS**: This is a message queuing service, not a compute service - **Amazon EC2**: While EC2 can be made scalable using Auto Scaling Groups, it requires manual configuration and doesn't automatically scale by default - **Amazon Aurora**: This is a managed relational database service, not a compute service Lambda's automatic scaling makes it ideal for applications with variable or unpredictable workloads.

Author: Ritesh Yadav