Wireless AC 802.11ac (aka 5G Wi-Fi) is the next step in Wireless networking after Wireless-N 802.11n, currently is the most popular Wireless standard. Wireless AC is backward-compatible with N, meaning that a 5G Wi-Fi router will support N clients and 5G Wi-Fi clients will also be able to connect to an N router. Wireless-N, in turn, is backward compatible with the rest of the wireless standards, including 802.11g, 802.11b, and 802.11a.
What are the benefits of WiFi 802.11ac
Faster Throughput: Stream content, like 3D or HD videos, to your PC, Mac, media player or Smart TV
Higher Capacity: Connect multiple devices to the network simultaneously without dropping performance.
Broader Coverage: Extend range with fewer dead spots throughput the home.
Less Interference: Works on the 5Ghz frequency with minimal interference from other devices.
Improvements over 802.11n: 802.11ac offers data speeds up to 3.6Gbps vs 450Mbps offered by 802.11n
Wi-Fi Direct: Content can be shared between devices without passing through an access point