Quick answer
A LAN (Ethernet) cable connects computers, routers and devices for wired networking and internet. Inside are four twisted pairs of copper wires; the twisting and construction control interference and signal quality.
Cat5e supports gigabit speeds and is fine for most homes and offices. Cat6 has tighter construction (often with a separator) for higher bandwidth, lower error rates and better performance over longer runs or for heavier data — a good future-proofing choice. See what communication cables are used for.
APAR's Tarang Shakti LAN cable is available in Cat5e and Cat6 with four twisted copper pairs for fast, low-error connectivity.