Serial servers are essential networking devices that enable serial devices to communicate over Ethernet networks. They convert serial data (RS-232, RS-422, or RS-485) into IP packets, allowing remote access and management of industrial equipment such as PLCs, CNC machines, and sensors. Key features include real-time data transmission, multi-port connectivity, and robust protocols like TCP/IP. Common products in this category include Digi One SP, Moxa NPort 5150, and Lantronix UDS1100. These devices are widely used in automation, manufacturing, and IoT applications for seamless integration of legacy serial equipment into modern networked systems.