Not unlike a regular modem, Cable Modems are devices that use DOCSIS technology and enable you to hook up your computer to a local cable (mixed coax, copper and fibre optic network) operators service and receive data, voice and or Television services all in one.
This technology is often built into the operators Set-Top-Box unit, although some will offer separate modems or network (Ethernet/NIC) cards. Modern Cable Modems tend to include Router features too.
Please visit the following section for a more detailed description of cable broadband technology: