What is the purpose of a "glass cutter"?

The primary function of a glass cutter is to score the glass surface, which creates a controlled weakness in the material. This scoring allows the glass to snap cleanly along the line, making it easier to achieve precise cuts. When a glazier scores the glass with a cutting tool, they create a shallow groove, and with the right technique and pressure applied, the glass will break along that line. This method is essential for ensuring clean edges and minimizing waste, which is particularly important in glass installations where aesthetics and fit are crucial.

While some of the other choices mention aspects related to glass, they do not accurately reflect the main purpose and function of a glass cutter. For instance, cutting glass into small decorative pieces may happen, but it is not the intended or primary use of the tool. Similarly, reducing glare and installing glass pertain to different tools and processes in glazing work, rather than the specific action of cutting glass.