The lines on car rear windows: What they are and how they work

The lines you see on car rear windows are not decorative. They are thin wires made of metal and resin, embedded in the glass.

When the defroster is activated, electricity passes through these wires. The resistance to the current generates heat, which eliminates moisture, steam, and ice, ensuring clear visibility.

In short, these lines are essential for safety, allowing the driver to have a clear view to the rear.