Final answer:
The technology that delivers internet access via cable television companies using shared multipoint circuits is known as cable modem.
Step-by-step explanation:
The technology in question is cable modem access, which is a digital service that allows internet access through cable television companies. Data is transmitted over existing cable services, which are typically coaxial or sometimes fiber optic cables. Unlike DSL, which operates over telephone lines, or fiber-optic solutions that require a separate infrastructure, cable internet uses the same lines that deliver cable television. This allows for the use of shared multipoint circuits, where all messages on the circuit can be heard by all computers connected to it. This type of service also contributes to alleviating digital deserts, providing access to high-speed internet to areas that might otherwise be underserved.