Wi-Fi
Local wireless networking, convenient where Wi-Fi already exists, but power-hungry and limited to the range of the access point.
Wi-Fi offers high data rates at low connectivity cost inside buildings. It needs mains power or frequent charging for most devices, and someone has to manage network credentials.
Why it matters for business
Good for fixed, powered devices in your own buildings. Relying on a customer's Wi-Fi adds support effort: passwords change, networks are locked down, and IT teams must approve devices.