Bike locks are security devices designed to protect your bike from theft. They come in various forms, including U-locks, chain locks, and cable locks, each offering different levels of protection. U-locks are rigid and highly secure, ideal for locking the frame to a solid object. Chain locks provide flexibility and strength with hardened links, while cable locks are lightweight and convenient. Made from robust materials like steel, these locks are essential for securing your bike in public spaces, offering peace of mind when you leave your bike unattended.