A managed switch is a type of network switch that allows for greater control over the data traffic within a network. Unlike unmanaged switches, which operate with fixed settings, managed switches can be configured and monitored to optimize performance and security. They support features like VLANs (Virtual Local Area Networks), which help segment network traffic, and Quality of Service (QoS), which prioritizes certain types of data. These switches are commonly used in business environments where network reliability and performance are critical. They provide tools for network administrators to troubleshoot issues, manage bandwidth, and implement security measures. Overall, managed switches enhance the efficiency and security of network operations.