Wireless Local Area Network (WLAN) controllers – Allow communication
over short distances using radio signals instead of traditional network
cabling. WLAN controllers can be internal (expansion cards or integrated
to the system board) or external.
Wireless Wide Area Network (WWAN) controllers – Allow wireless
connectivity through cellular tower technology. A SIM card may be is
required for WWAN connectivity.
Bluetooth adapters – Allow Bluetooth-enabled devices to communicate
with each other over a short distance. Bluetooth adapters can be internal
(expansion cards or integrated to the system board) or external.