Virtual Machine
Azure Virtual Machines are image service instances Instances are the individual virtual machines that run on physical compute nodes inside the cloud. Users can launch any number of instances from the same image. Each launched instance runs from a copy of the base image. Any changes made to the instance do not affect the base image.
Azure Load Balancer
An Azure load balancer is a Layer-4 (TCP, UDP) load balancer that provides high availability by distributing incoming traffic among healthy VMs. A load balancer health probe monitors a given port on each VM and only distributes traffic to an operational VM.
Network Interface Card
A network interface enables an Azure Virtual Machine to communicate with internet, Azure, and on-premises resources. When creating a virtual machine using the Azure portal, the portal creates one network interface with default settings for you.