Shielding (STP vs UTP)
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Whether an Ethernet cable has metallic shielding around its wire pairs to block interference.
UTP (Unshielded Twisted Pair) is standard for most home and office installs. STP and S/FTP add foil or braided shields for environments with heavy EMI (factories, near power lines). Shielded cables require proper grounding or they can actually increase noise.