Which tool is primarily used for cutting curves in wood?

The jigsaw is primarily used for cutting curves in wood due to its design and functionality. It features a straight, reciprocating blade that allows for intricate and precise cuts. This capability makes it ideal for creating various shapes and curves, whether it be in plywood, hardwood, or other types of materials.

Unlike a table saw, which is designed for straight cuts along the grain of larger pieces of wood, or a band saw, which can also cut curves but is typically better suited for resawing or thicker materials, the jigsaw excels in maneuverability and the ability to navigate tight radii. A router, while versatile for shaping edges and hollowing out areas, does not function as a cutting tool for curves in the same way that a jigsaw does. Instead, it is more focused on decorative profiles and joinery.

Therefore, when the task requires cutting curves in wood, the jigsaw stands out as the most effective tool for the job, making it the correct choice in this context.