The network adapter in a computer has the function to interact with other computers on the same local area network (LAN), and probably also with the Internet (WAN). Most new computers already have network cards, but it may need to be replaced with a better or one that can handle wireless networking (WiFi). NICs can be connected as via the USB port, PCI slot, or PCI Express slot. Linky, Deltaco, HP and D-link is great to network. Prices from 59 stores in this category.