Which service allows you to run code as functions without needing to provision or manage servers?

AWS Lambda is a serverless compute service that runs your code in response to events and automatically manages the underlying compute resources for you. Lambda runs your code on high-availability compute infrastructure and performs all the administration of the compute resources, including server and operating system maintenance, capacity provisioning and automatic scaling, code and security patch deployment, and code monitoring and logging. All you need to do is supply the code.