Foil-shielded and Copper-shielded
To protect your data in a noisy area (with high EMI), choose a shielded cable. Foil is the most basic cable shield, but a copper-braid shield provides more protection.
Use a foil-shielded cable in busy office or retail environments. For industrial environments, you may want to choose a copper-braid shield. For quiet office environments, choose unshielded cable.