Cablevision Systems Corporationwas an American cable television company with systems serving areas surrounding New York City.
It was the fifth-largest cable provider and ninth-largest television provider in the United States. Throughout its existence and in its final years, Cablevision exclusively served customers residing in New York, New Jersey, Connecticut, and a small part of Pennsylvania. However, at one time it provided service in as many as 19 states. Cablevision also offered high-speed Internet connections (Optimum Online), digital cable (Optimum TV/IO Digital Cable), and VoIP (Optimum Voice) phone service (the eighth-largest telephone provider in the U.S.) through its Optimum brand name. Cablevision also offered a WiFi-only mobile phone service dubbed Freewheel.
On June 21, 2016, Cablevision was acquired by European telecom conglomerate Altice. The former Cablevision services operate under Altice USA which continues to operate brands Optimum Online, Optimum Voice, and Optimum TV.
