Final answer:
A WWAN card enables communication over a cellular network and allows laptops to connect to the internet using cellular networks.
Step-by-step explanation:
The type of laptop expansion card that enables communication over a cellular network is referred to as a WWAN card. It stands for Wireless Wide Area Network card. A WWAN card allows laptops and other devices to connect to the internet using cellular networks, such as 4G or 5G. This enables users to have internet access even when they are not within range of a Wi-Fi network.