A device that adds wireless connectivity to a laptop or desktop computer. All of the adapters below are available as external USB modules as well as PCI or PCI Express (PCIe) cards that plug into an empty slot on the motherboard. See PCI and PCI Express.Wi-FiWi-Fi adapters provide connectivity to the local area network (LAN) in the home or office. Typically used to add Wi-Fi to desktop computers, they can also retrofit older laptops that never came with Wi-Fi. See Wi-Fi and Ethernet.Cellular (3G, 4G)Cellular wireless adapters, also called "cellular modems," "air cards," "broadband adapters" or "broadband cards," deliver the same 3G and 4G wireless service that smartphones use. See wireless broadband and cellular modem.BluetoothBluetooth provides short range transmission between the computer and a mouse or keyboard. See Bluetooth.