Explanation
Just as a blueprint allows an engineer or an architect to sketch a project's design parameters, Azure Blueprints enables cloud architects and central information technology groups to define a repeatable set of Azure resources that implements and adheres to an organization's standards, patterns, and requirements.
Blueprints are a declarative way to orchestrate the deployment of various resource templates and other artifacts such as:
Role Assignments
Policy Assignments
Azure Resource Manager templates
Resource Groups
Reference:
https://docs.microsoft.com/en-us/azure/governance/blueprints/overview