Microsoft Azure Functions is a serverless computing service that allows developers to run code in response to events without managing servers. It automatically scales based on demand, meaning you only pay for the resources you use when your code is executed. This makes it ideal for tasks like processing data, integrating systems, or responding to web requests. With Azure Functions, you can write code in various programming languages, including C#, JavaScript, and Python. It integrates seamlessly with other Azure services, enabling developers to build complex applications quickly and efficiently while focusing on writing code rather than managing infrastructure.