A horizontal lifeline is a safety system used in various industries to protect workers from falls when operating at heights. It typically consists of a flexible line, such as a wire rope, tensioned between two anchor points. Workers attach their safety harnesses to this line via a lanyard, allowing them to move freely along its length while remaining securely tethered. Horizontal lifelines are essential in construction, maintenance, and industrial settings, providing continuous fall protection and ensuring compliance with safety regulations.