MU-MIMO
Multi-User MIMO — Wi-Fi serves multiple clients simultaneously.
Multi-User Multiple-Input Multiple-Output (MU-MIMO) lets a Wi-Fi router communicate with multiple client devices in parallel rather than one at a time. Wi-Fi 5 introduced downlink MU-MIMO (up to 4 clients); Wi-Fi 6 added uplink + scaled to 8 clients; Wi-Fi 7 doubles the channel-width capacity beyond MU-MIMO's gains. The reason your home Wi-Fi handles 30+ devices at once.