An Azure subscription is a service agreement that allows users to access and utilize resources provided by Microsoft Azure, a cloud computing platform. It enables individuals and organizations to create, manage, and deploy applications and services in the cloud. Each subscription comes with a set of resources, such as virtual machines, databases, and storage, which can be scaled according to needs. Users can choose from different subscription types, including free, pay-as-you-go, and enterprise plans, depending on their requirements and budget. Billing is based on the resources consumed, making it flexible for various projects and workloads.