What are Azure instances?
Keeping this in view, what are azure container instances?
Azure Container Instances is a service that enables a developer to deploy containers on the Microsoft Azure public cloud without having to provision or manage any underlying infrastructure.
Keeping this in consideration, what is role instance in Azure?
A role instance is a single deployment of your role to a dedicated virtual machine. All role instances are automatically put behind a hardware load-balancers. But be aware - each instance you create consumes compute hours!
Microsoft recently introduced Azure Reserved Instances (Azure RI) to help Azure's most active customers save on long-term VM usage. By committing to a one or three-year benefit, Azure customers can now reserve VMs in advance at a deep discount, saving them as much as 82% off standard pay-as-you-go pricing.