What tool is specifically used to cut internal threads?

The tool specifically used to cut internal threads is a tap. Taps are designed with sharp cutting edges that allow them to create threads inside pre-drilled holes, enabling the insertion of screws or bolts that match those threads. This is crucial in various applications where a secure fastening is required within an object, such as in metalworking or woodworking.

In comparison to the other tools listed, a screwdriver is used for turning screws and cannot create threads. A wrench is designed for gripping and turning nuts and bolts, and likewise does not cut threads. Pliers are multipurpose tools primarily used to grasp and manipulate objects but are not intended for thread cutting either. The specialized design and purpose of taps make them the correct answer for the task of cutting internal threads, setting them apart from the other tools mentioned.