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A screen guard, also known as a screen protector, is a thin, transparent layer of material applied directly to the surface of an electronic device's screen, such as a smartphone, tablet, or smartwatch. Its primary purpose is to shield the original screen from scratches, scuffs, and other forms of physical damage that can occur during daily use. Screen guards are typically made from materials like tempered glass or a type of polyurethane plastic and come in various finishes, including glossy, matte, or even with anti-glare properties. While they provide a crucial layer of protection, they are designed to be thin enough to not interfere with the device's touch sensitivity or visual clarity. When a screen guard is applied, it effectively acts as a sacrificial layer—it takes the brunt of the damage, preserving the pristine condition of the device's actual display underneath.