Azure is a cloud computing platform provided by Microsoft. It provides a wide range of cloud-based computing services, including computing power, storage, database, analytics, and machine learning, among others.

Azure provides an infrastructure-as-a-service (IaaS) model, which enables businesses and individuals to use Microsoft's computing resources to build and run their applications and services. Azure also offers platform-as-a-service (PaaS) and software-as-a-service (SaaS) models to support various use cases and customer needs.

Some of the popular Azure services include Azure Virtual Machines, Azure Storage, Azure SQL Database, Azure Cosmos DB, Azure Machine Learning, Azure Cognitive Services, and Azure Functions, among others.

Azure has a pay-as-you-go pricing model, which means that customers only pay for the resources they use and can scale their usage up or down as needed. This makes it a cost-effective option for businesses of all sizes, from startups to large enterprises.

Overall, Azure provides a flexible, scalable, and reliable cloud computing platform that can help businesses and individuals accelerate innovation and drive digital transformation. It also integrates well with other Microsoft tools and services, making it a popular choice for organizations already using Microsoft technologies.