Shielded twisted pair cable has individual pairs of wires wrapped again and again in a foil for additional protection. Unshielded twisted pair cable has each pair of wire twisted and wrapped in tubing without any protection.
Unlike unshielded twisted pair, the shielded twisted pair requires a grounding cable. According to geeksforgeeks.org, data rates of shielded twisted pair cables are higher than unshielded twisted pair. Furthermore, shielded twisted pair cables have less noise and cross talk than the unshielded twisted pair.