The MediaTek 802.11ac MT7663 Wireless LAN Card is a network adapter designed for Wi-Fi connectivity in computers and devices. It supports the 802.11ac Wi-Fi standard, which is commonly referred to as Wi-Fi 5. This standard provides faster speeds, better range, and improved performance compared to earlier Wi-Fi standards like 802.11n (Wi-Fi 4). The MT7663 chip is typically used in laptops, desktops, and other devices to provide reliable wireless internet connectivity.