Used in old laptops to connect to Wi-Fi networks, it was inserted into a special slot and allowed wireless Internet access.

Installed in a PCI slot on the motherboard, it allows the computer to connect to wired networks via an Ethernet cable.

Connects to a USB port and allows the computer to connect to wireless networks without the need for an internal card.

Installed in a PCI slot on the motherboard, it enables desktop computers to connect to wireless networks.