RG59 is an older form of coaxial cable installed in most homes built before the 90's. It has a 20 gauge center conductor and is not as well shielded as RG6. It is also smaller in overall diameter. It uses an "F" style connector. RG59 does not carry the higher cable channels and satellite TV clearly and is not recommended for use with cable modems.
RG59 cables are standard issue coaxial cables. These cables run from your satellite dish system on the outside of your home to the satellite TV receiver above your television. R59 cables are inexpensive and reliable and are the best way to transmit information from an output to an input.
Standard coaxial used for cable TV (75 Ohm).