Azure is Microsoft's cloud computing platform that provides virtual machines, storage, databases, and application services through a global network of Microsoft-managed data centers. It allows users to avoid upfront infrastructure costs by paying only for resources consumed. Azure offers various computing and application services, as well as tools for networking, storage, databases, web/mobile development, security, and containers. Customers subscribe to Azure and use its services to create and manage cloud-based resources like VMs and databases. Microsoft provides different tiers of paid customer support for Azure ranging from $29 to over $1,000 per month depending on support needs.