CBS is a television network.
CBS . Under Paley 's guidance , CBS would first become one of the largest radio networks in the United States , and eventually one of the Big Three American broadcast television networks . In late 2005 , Viacom split itself into two separate companies , and re-established CBS Corporation -- through the spin-off of its broadcast television , radio and select cable television and non-broadcasting assets -- with the CBS television network at its core .