What Does Modem Card Mean?
A modem card is an internal type of modem that is plugged into the PCI slot of a PC motherboard. A modem is a communications device that allows a computer to send and receive data through telephone or cable lines.
Techopedia Explains Modem Card
Most modern computers connect to a home network, a local area network or the Internet using an external modem or through an Ethernet port or a wireless device such as a USB dongle. However, during the early days of the Internet and before the advent of cable Internet and DSL connection, it was more common to use a modem card, which had to be added to a desktop computer manually, like a video card or sound card. This modem card used a landline telephone to connect to an Internet service provider, a technology known as a “dial-up connection.”