They help to connect devices within a local network with the guidance of devices like PCs, routers, and switches. These are basically physical cables, and they do not have many limitations. They are quite stretchable and help to carry signals with ease, without any attenuation.
These type of cables are required for a particular application like RG-6 or RG-11.
LAN cable has bare solid copper conductor, HDPE (high-density polyethylene) insulation, then two such cores are twisted to make a pair. such 4 pairs are then bunched together and then there is the jacket of generally grey flame retardant PVC.
For LAN Cable categories i.e. Cat3, Cat4, Cat5, Cat5e, Cat6, and Cat7