Creating an Azure free account is one way to access Azure services. When you start using Azure with a free account, you get USD200* credit to spend in the first 30 days after you sign up. In addition, you get free monthly amounts of two groups of services: Popular services, which are free for 12 months and 25+ other services that are free always. Free services are based on resource and region availability.
refer- https://azure.microsoft.com/en-in/free/free-account-faq/
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