A 300 Mbps WiFi LAN card is a network interface card (NIC) designed to connect a computer or device to a wireless network at speeds of up to 300 megabits per second (Mbps). This type of LAN card typically uses the 802.11n WiFi standard, which is capable of providing decent wireless performance for everyday internet activities such as web browsing, streaming video, and online gaming. However, for demanding tasks like high-definition video streaming or large file transfers, you might consider a faster WiFi standard such as 802.11ac or 802.11ax (WiFi 6).