Lambda

Run code without provisioning servers using AWS Lambda's event-driven compute service.

Lambda executes code in response to triggers like S3 uploads, DynamoDB updates, or HTTP requests via API Gateway. It handles the heavy lifting: automatic scaling, high availability, and runtime patching. You pay only for the compute time consumed (measured in 1ms increments) across runtimes like Node.js, Python, and Go. It is the core engine for serverless architectures, supporting everything from simple data transformations to complex backend workflows.

https://aws.amazon.com/lambda/