Which AWS service serves serverless functions on a schedule?

AWS Lambda is designed to run code in response to events, making it a prime choice for executing serverless functions. One of its powerful features is the ability to trigger these functions on a schedule using Amazon CloudWatch Events (now referred to as EventBridge). This capability allows you to automate tasks, such as running scripts or processing data at specific intervals, without the need to manage the underlying server infrastructure.

The serverless nature of AWS Lambda means that you only pay for the compute time your code consumes while it's running, eliminating the need for provisioning or maintaining any servers. This aligns perfectly with scenarios where you need to perform tasks at regular intervals without investing in dedicated resources.

Other services listed, such as EC2 and Fargate, require more management and do not inherently provide a simple way to run functions automatically on a schedule without additional setup and orchestration. AWS S3, while an essential storage service, does not serve the purpose of executing functions on a schedule. Therefore, AWS Lambda stands out as the appropriate service for serverless function execution based on scheduling.