Hi @Shailendra Soni ,
Thank you for asking this question on the Microsoft Q&A Platform.
An Azure subscription is a logical container used to provision resources in Azure. It holds the details of all your resources like virtual machines (VMs), databases, and more. When you create an Azure resource like a VM, you identify the subscription it belongs to. As you use the VM, the usage of the VM is aggregated and billed monthly.
A bit of background of Azure AD, Tenant and Subscription.
a tenant is associated with a single identity (person, company, or organization) and can own one or several subscriptions
a subscription is linked to a payment setup and each subscription will result in a separate bill
in every subscription, you can add virtual resources (VM, storage, network, ...)
Every tenant is linked to a single Azure AD instance, which is shared with all tenant's subscriptions
Resources from one subscription are isolated from resources in other subscriptions
An owner of a tenant can decide to have multiple subscriptions:
- when Subscriptions limits are reached
- to use different payment methods
- to isolate resources between different departments, projects, regional offices, and so on.
With regards to the account for Azure Subscription please check this article.4-multiple-subscriptions
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