The Cisco Meraki MS390 series is a line of high-performance, cloud-managed stackable access switches designed for enterprise campus and branch networks. They offer Multi-Gigabit (mGig) ports, 480G physical stacking bandwidth, and modular 10/40G uplinks, designed to support high-speed 802.11ax/Wi-Fi 6 APs, along with advanced security features like Adaptive Policy and StackPower.