A torque wrench is a specialized tool used to apply a specific amount of force to a fastener, such as a bolt or nut. It ensures that the fastener is tightened to the manufacturer's recommended specifications, which is crucial for safety and performance in various applications, including automotive and construction. There are different types of torque wrenches, including click-type, beam-type, and digital models. Each type has its own method of indicating when the desired torque level is reached, helping users avoid over-tightening, which can lead to damage or failure of components.