The function and function of wireless network card are the same as ordinary computer network card, which is used to connect to the local area network. It is only a device for sending and receiving signals, and can only be connected to the Internet when it finds the exit of the Internet. All wireless network cards can only be limited to the area where there is a wireless LAN. A wireless network card is one that uses wireless signals instead of wired connections. Wireless network card can be distinguished according to different interface types. The first one is USB wireless network card, which is the most common one at present. The second is a wireless PCI interface card dedicated to desktop computers