Why does one wiper work and the other doesn't?

If one windshield wiper works while the other doesn't, it could be due to several reasons such as a blown fuse, a faulty wiper motor, or a damaged wiper arm. Additionally, the linkage connecting the wipers might be broken or misaligned, preventing one from moving. It's also possible that the wiper blade itself is jammed or stuck. Checking the electrical connections and components can help identify the specific issue.