Coaxial Cable, a high frequency transmission cable that consists of a center wire surrounded by insulation and then a grounded shield of braided wire. Coaxial cable may be rigid or flexible. Rigid types have a solid sheath, while flexible types have a braided sheath, both usually of thin copper wire. The inner insulator, also called the dielectric has a significant effect on the cable's properties, such as its characteristic impedance and its attenuation. The inner insulator may be solid or perforated with air spaces. Coaxial cable has the advantage of very minimum electrical and radio frequency interference and also it can carry a lot a data. Coaxial cabling is the primary type of cabling used by the cable television and is also widely used for computer networks as Ethernet. Although more expensive than standard telephone wire, it is much less susceptible to interference and can carry much more data.