Coaxial cable is commonly used by cable operators, telephone companies, and internet providers around the world to convey data, video, and voice communications to customers. It has also been used extensively within homes.
It has been around for a long time as a technology (since the early 20th century) and has many singular advantages for reliable, accurate transmission.
It also has limitations that will cause it to be replaced in some cases by fiber optic cable, category cable or, sometimes, by wireless signals.
The key to the coaxial cable's success has been its shielded design, which allows the cable's copper core to transmit data quickly, without succumbing to interference or damage from environment factors.
The three most common cable sizes are RG-6, RG-11 and RG-59: