What are the three basic types of locks?

1. padlocks: Portable, freestanding locks with a U-shaped shackle. They’re versatile—used for lockers, gates, or storage units—and come in keyed or combination variants.

2. Deadbolts: Installed on doors (often with doorknobs), they feature a solid metal bolt that extends into the door frame. They’re more secure than spring latches, as they can’t be forced open with a credit card.

3. Cylinder Locks: Found in cars, cabinets, and some doors, they use a cylindrical core that rotates with a key. Their compact design makes them suitable for narrow spaces. These three types cover most basic security needs, with variations (e.g., smart deadbolts) enhancing functionality.