Which AWS service allows you to run code without provisioning or managing servers?

AWS Lambda is a serverless computing service that enables you to run code in response to events without the need to provision or manage servers. This is a key feature of Lambda, as it abstracts away the underlying infrastructure, allowing developers to focus on writing code and deploying it rapidly.

With AWS Lambda, you can execute code for various applications, such as processing incoming data from Amazon S3 or invoking functions through an API call via AWS API Gateway. The service automatically scales based on the demand for the function, handling requests in a fully managed environment. This model allows for improved efficiency and reduces operational overhead since there is no need to maintain the underlying servers.

In contrast, other options involve more server management or are intended for different purposes. AWS Batch is designed for running batch jobs, AWS Elastic Beanstalk is a platform as a service that requires managing application resources, and AWS EC2 is an Infrastructure as a Service (IaaS) offering that requires you to launch and manage virtual servers directly. These alternatives do not provide the same serverless experience that Lambda offers.