What service automatically handles server and operating system maintenance, capacity provisioning, and scaling?

The service that automatically handles server and operating system maintenance, capacity provisioning, and scaling is AWS Lambda. This serverless computing service allows users to run code without worrying about the underlying infrastructure. It automatically manages the compute resources required to run your application, including provisioning and scaling as needed.

With AWS Lambda, developers can focus solely on their code instead of the operational aspects like server maintenance or capacity management. This is particularly useful for applications with variable workloads, as Lambda can scale up or down seamlessly to meet demand without manual intervention.

The other options provided serve different purposes: AWS Glue is designed for data integration and ETL processes, Amazon EC2 offers virtual servers but requires management of instances and scaling by the user, and AWS Batch is tailored for running batch processing jobs but does not provide the same level of abstraction from infrastructure management as Lambda does.