Professional Answer: Guy wires, also known as stay wires, are a fundamental part of the structural integrity of overhead lines. They are tensioned steel cables used to reinforce line supports, particularly at points where there are significant lateral forces. These forces occur at dead-end poles (the end of a line) and corner poles (where the line changes direction), where the tension of the conductors is not balanced. Guy wires are anchored to the ground and provide a counteracting force, preventing the pole from bending or collapsing, thus ensuring the stability and safety of the entire overhead system.