A glass cutter is a hand tool used to score glass, making it easier to break along a straight line. It typically features a small, sharp wheel made of hardened steel or tungsten carbide that creates a shallow groove on the glass surface. This groove weakens the glass, allowing it to be snapped cleanly along the line. Glass cutters come in various designs, including manual and electric versions. They are commonly used in the fields of glass art, construction, and crafting. Proper technique and safety precautions are essential when using a glass cutter to prevent injury and ensure clean cuts.