PCI Express is mainly used in consumer, server, and industrial applications. It can be used to connect motherboard-mounted peripherals to create a motherboard-level interconnection. It can also be used as an expansion card interface for add-in boards. The list of PCI Express applications includes desktop computers, servers, workstations, storage systems, Redundant Array of Independent Disks (RAID) controllers, fibre channel host-bus adapters, routers, switches, and a range of other instrumentation devices.