What is the primary function of cable modems?

The primary function of cable modems is to connect personal computers to cable TV systems, enabling access to the internet through the same infrastructure that delivers cable television programming. This technology takes advantage of the high bandwidth capabilities of coaxial cable television lines to provide users with a high-speed internet connection.

Cable modems work by converting data from a user's computer into a format that can be transmitted over the cable system and vice versa. This allows for a seamless integration of internet service along with television services, making it a convenient option for many households.

The other options revolve around different technologies or methods that are not the principal function of a cable modem. For example, enhancing wireless communication pertains more to devices like routers and access points, while providing broadband service via satellite relates to a different type of internet service entirely. Enabling fiber-optic connections pertains to a distinct category of broadband technology, not one covered by cable modems. Thus, the answer that pertains directly to the function of cable modems is connecting personal computers to cable TV systems.