A CableCARD™ is a small device provided by your cable service provider that, when installed into a TV or other device, allows you to access digital cable services without the need for a Set-Top Box.
It's about the size of a thick credit card, and the CableCARD fits into a special slot built into a growing number of peripheral devices, such as TVs, DVRs and PCs.
There are two types of CableCARD-compatible TV-ready devices:
Tru2way® devices are two-way capable and allow you to receive nearly all TWC services (The only exception is DVR service which requires, a DVR Set-Top Box).
Unidirectional Digital Cable Products (UDCPs) are one-way devices and can access basic and digital channels, although channels are delivered via Switched digital.