appliance is a PC with different ports and softwares (such as PfSense firewall) designed to optimize
and secure OT networks services and operations.
Specialized Functionality such as firewalls, routers, switches, load balancers, and intrusion detection/prevention systems
Rack or desktop format depending on the network size ( from 3 RJ45 ports to many copper and fiber ports)
Ease of Deployment
Optimization and Acceleration: such as content delivery network (CDN) appliances help deliver web content more efficiently by caching and serving it from servers closer to the end-users.
Integration with Other Systems to ensure that these appliances can be part of a larger, cohesive network infrastructure