The AVM ISDN-Controller FRITZCard PCI is a hardware device produced by AVM, a company known for its telecommunications and networking equipment. The FRITZCard PCI is a specific model designed to allow computers to connect to ISDN (Integrated Services Digital Network) networks via a PCI (Peripheral Component Interconnect) slot in the motherboard. It provides a way for users to connect to the internet or make voice calls over ISDN lines, which were more common before broadband internet and VoIP technologies became widespread.

The Windows driver for this card enables the operating system to recognize and properly interface with the card, allowing users to use it for internet access, faxing, or voice services.