The different between shielded and unshielded network cables

What is shielded network cables?

Shielded twisted pair cable (STP) has the individual pairs of wires wrapped in foil, which are then wrapped again for double protection.

What is unshielded network cable?

Unshielded twisted pair cable (UTP) has each pair of wires twisted together. Those wires are then wrapped in tubing without any other protection.

What is the difference between STP and UTP?