Azure is a cloud computing platform developed by Microsoft. It provides infrastructure-as-a-service (IaaS) and platform-as-a-service (PaaS) services and supports many different programming languages, tools, and frameworks, including Node.js, Java, Python, .NET, and PHP. It also allows developers to build, deploy, and manage applications using Microsoft Azure's services, such as storage, networking, analytics, compute, and mobile. With Azure, developers can quickly create web apps, mobile apps, virtual machines, and other types of services in the cloud.