Azure Functions is a serverless compute service provided by Microsoft that allows developers to run event-triggered code without managing the underlying infrastructure. As a part of Azure's Platform as a Service (PaaS) offerings, it enables the execution of small pieces of code, or "functions," in response to various events. These functions can be triggered by HTTP requests, database updates, message queues, timers, and more. Azure Functions is designed for flexibility, scalability, and speed, making it suitable for automating tasks, integrating systems, and building microservices. It supports multiple programming languages, including C#, JavaScript, Python, Java, and PowerShell.
Key features of Azure Functions include serverless compute, event-driven execution, multiple language support, and built-in integrations with other Azure services like Azure Storage, Service Bus, and Cosmos DB. This service automatically scales resources in response to traffic, so users only pay for the resources used during function executions. There are several pricing plans available, including Consumption, Flex Consumption, and Premium plans. The Consumption plan bills based on per-second resource consumption and executions, including a monthly free grant of 1 million requests and 400,000 GB-s of resource consumption. The Flex Consumption plan offers a monthly free grant of 250,000 executions and 100,000 GB-s of resource consumption. The Premium plan provides enhanced performance and is billed on a per-second basis, based on vCPU and GB consumption. Azure Functions is generally available, with support for availability zones in certain plans and regions.
