Which service provides serverless computing in Azure?

Azure Functions is a core service within Azure's serverless computing offerings. It is an event-driven platform where you can execute small pieces of code, or "functions," without having to provision or manage the underlying infrastructure like virtual machines or containers. The platform automatically scales and manages the resources required to run the code in response to various triggers, such as an HTTP request or a new item in a storage queue. This model allows developers to focus solely on their application logic, and billing is based on the actual execution time and resources consumed, which is a key characteristic of serverless computing.

A. Azure Virtual Machines: This is an Infrastructure as a Service (IaaS) offering that requires users to provision, manage, and maintain the server and its operating system.

B. Azure Container instances: This service runs containers without managing virtual machines, but it is a serverless container orchestration service, not the primary event-driven code execution platform.

D. Azure storage account: This is a cloud storage solution for data services like blobs, files, and queues; it is not a compute service.

1. Microsoft Learn, AZ-900: Describe Azure compute and networking services. In the "Describe serverless computing" unit, it states, "Azure has two implementations of serverless compute: Azure Functions which are code-based (imperative) and Azure Logic Apps which are design-based (declarative)." This directly identifies Azure Functions as a primary serverless compute service.

2. Microsoft Learn, Introduction to Azure Functions. The overview section states, "Azure Functions is a serverless solution that allows you to write less code, maintain less infrastructure, and save on costs. Instead of worrying about deploying and maintaining servers, the cloud infrastructure provides all the up-to-date resources needed to keep your applications running."

3. Microsoft Learn, Azure virtual machines overview. The documentation clearly defines this service as Infrastructure as a Service (IaaS), stating, "Azure virtual machines (VMs) is one of several types of on-demand, scalable computing resources that Azure offers... This is an example of Infrastructure as a Service (IaaS)."

4. Microsoft Learn, Introduction to Azure Storage. The "What is Azure Storage?" section describes the service as "Microsoft's cloud storage solution for modern data storage scenarios," listing its data services (Blobs, Files, Queues, etc.), confirming it is not a compute service.