The ThinkPad Integrated 56K Modem is a built-in hardware modem found in many older Lenovo ThinkPad laptops. It supports dial-up internet connections at a speed of 56 Kbps (kilobits per second), typically used for connecting to the internet through a telephone line, though this technology is mostly obsolete today.

The Windows driver for this modem allows the operating system to communicate with and control the hardware modem, enabling it to function properly for tasks like making dial-up internet connections or sending faxes.