Final answer:
The Azure service that allows you to automatically add or remove virtual machines in response to demand on your applications is called Virtual Machine Scale Sets (VMSS). VMSS enables easy management of a group of identical VMs and scales the number of instances based on demand.
Step-by-step explanation:
The Azure service that allows you to automatically add or remove virtual machines in response to demand on your applications is called Virtual Machine Scale Sets (VMSS). VMSS allows you to easily manage a group of identical VMs as a single entity, and it scales the number of VM instances up or down based on the demand.
When configuring VMSS, you can define scaling rules based on metrics like CPU utilization or network traffic to automatically adjust the number of VMs. This ensures that your environment can handle increased workload during high demand periods and reduces costs during low demand periods.
By using VMSS, you can achieve high availability, improve performance, and optimize costs by creating an elastic environment that dynamically adjusts to match the needs of your applications.