A wrench is a hand tool used to provide grip and mechanical advantage in applying torque to turn objects, typically nuts and bolts. Wrenches come in various shapes and sizes, including adjustable wrenches, socket wrenches, and combination wrenches. They are essential tools in many fields, including automotive repair, construction, and plumbing. The design of a wrench allows it to fit snugly around fasteners, making it easier to tighten or loosen them. Some wrenches, like the ratchet wrench, have a mechanism that allows for continuous turning without needing to reposition the tool. This efficiency makes wrenches invaluable for both professionals and DIY enthusiasts.