Coaxial Cables

The inner core is composed of two concentric metal conductors 

• Inner conductor is solid copper wire

• Outer mesh is made of aluminum or tin coated copper

Over that is a PVC plastic insulator 

Over that is a PVC plastic cable sheath

Pros: Highly resistant to EMI

Highly resistant to physical damage

Cons: More expensive than UTP
Inflexible
Not supported by newer standards

RG-58: 10Base2 Ethernet (Thinnet)
Resistance Rating: 50 ohms

RG-6: Cable TV / Satellite TV / Cable Networking
Resistance Rating: 70 ohms

Ohms explained: Measure of electrical resistance

Coaxial cable uses the F-type connector.
The F-type connector is twisted onto the cable or installed using a compression tool.