What is a pedal wrench and how is it used in bicycle maintenance?

A pedal wrench is a tool used to remove and install pedals on a bicycle. It has a long handle and a thin, flat head that fits into the pedal's axle. To use a pedal wrench, you place the wrench on the pedal axle and turn it in the direction needed to loosen or tighten the pedal. This tool is essential for maintaining and repairing bicycles.