Which AWS service provides a serverless computing platform?

AWS Lambda is the service that provides a serverless computing platform. It allows developers to run code for virtually any type of application or backend service without the need for provisioning or managing servers. With Lambda, you can execute your code in response to events, such as changes in data or system state, making it ideal for tasks like running server-side logic, processing files in real time, or handling API requests.

The core advantage of AWS Lambda being a serverless platform lies in its ability to automatically scale your applications by running code in response to incoming requests. You pay only for the compute time that you consume—there's no charge when your code is not running. This model allows for efficient resource utilization and cost management.

In contrast, the other services mentioned do not offer a serverless architecture. Amazon RDS requires management of database instances, Amazon S3 is primarily a storage service, and Amazon EC2 entails provisioning and managing virtual servers, which contradicts the serverless model that AWS Lambda embodies.