Sliding door locks are mechanisms designed to secure sliding doors, such as patio doors or glass doors, from unauthorized access. They are essential for enhancing home security and privacy. There are various types of sliding door locks available, each with its own features and level of security. Some common types include:

1. Keyed Locks: These are traditional locks that require a physical key to lock and unlock the sliding door. They offer good security but can be inconvenient if you misplace the key.

2. Mortise Locks: A mortise lock is installed inside the door frame, making it more secure and tamper-resistant. It requires a key to operate, and some models also come with additional bolts for increased security.

3. Lever or Handle Locks: These locks use a lever or handle to engage or disengage the lock. They are easier to operate than keyed locks but might not offer the same level of security.

4. Sliding Bolt Locks: Sliding bolt locks are simple locks that use a metal bolt or latch to secure the door in place. They can be mounted on the frame or the door itself.

5. Foot Locks: Foot locks are usually mounted at the bottom of the sliding door and can be engaged with a foot or hand to prevent the door from sliding.

6. Security Bars: These are adjustable bars that can be placed in the track of the sliding door to prevent it from opening. They offer an additional layer of security.

7. Keyless Locks: Some modern sliding door locks use electronic keypads or smart technology, allowing you to enter a PIN or use a smartphone app to lock and unlock the door.

When choosing a sliding door lock, consider the level of security you need, ease of use, and compatibility with your sliding door type. Proper installation and regular maintenance are essential to ensure the locks function effectively and keep your home secure. If you're uncertain about which lock to choose or how to install one, it's best to consult a professional locksmith or security expert.