OFDMA (WiFi)
Orthogonal Frequency-Division Multiple Access — a key feature in WiFi 6 (802.11ax) that splits a channel into smaller "resource units" (RU) so several clients can transmit/receive at once in the same transmission. Big efficiency gains in dense environments.
Difference from older WiFi (OFDM): previously a client got the whole channel at a time → lots of waiting in congestion. OFDMA lets the access point split the channel between several clients at once (like 5G), perfect for many small packets (IoT, voice, many phones). Win: lower latency and higher total throughput when many devices compete, not necessarily higher peak speed for a single device. Combined with MU-MIMO (spatial multiplexing). A cornerstone of why WiFi 6/6E/7 is so much better in crowded venues (offices, arenas) than WiFi 5. Borrowed directly from the cellular world's technology.