What unique purpose does a keyhole saw serve?

A keyhole saw is specifically designed for cutting circles or curves, which is especially useful for creating holes in materials like wood or drywall. Its long, narrow blade enables users to maneuver and cut out small circular shapes, such as those needed for keyholes, hence its name. This saw is ideal for making precise, intricate cuts where a standard saw wouldn't be able to reach or operate effectively, making it an important tool for detailed woodworking and similar projects. Other options such as cutting straight lines or measuring angles do not align with the unique function of a keyhole saw, which is focused on handling tight curves and holes.