More than just TV
CATV is a shorthand term for cable television service.
The cabling infrastructure that supports cable TV also supports cable internet.
CATV Infrastructure
Cable providers operate directly or lease internet capacity to support customers.

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DOCSIS defines how digital signaling over CATV lines works.
Many providers offer multiple plans ranging from low to high end.
The same punch in of cable is used to connect a cable modem to cable service.
These cables use a standard F style connector, also called a CATV connector.
These connectors were used with analog TV setups before cable TV existed.
CATV also traditionally refers to a different kind of television service thanIPTV.