Door locks are devices used to secure doors, preventing unauthorized access. They come in various types, including deadbolts, padlocks, and smart locks. Each type operates differently, but their main purpose is to provide safety and privacy for homes and businesses. Most door locks function with a key or a combination, while smart locks can be controlled via smartphones or keypads. The effectiveness of a door lock depends on its design and materials, with stronger locks offering better protection against break-ins. Regular maintenance is essential to ensure locks operate smoothly and securely.