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An auxiliary latch serves the primary function of providing additional security to a door. This type of latch complements the main locking mechanism, enhancing the overall security of a door system by ensuring that even if the primary lock is compromised, the auxiliary latch remains engaged to help secure the door.

Auxiliary latches are commonly found on exterior doors and are designed to prevent unauthorized entry. They often engage in a way that reinforces the door against forced entry, making it significantly more difficult for someone to break in. This added layer of security is particularly important in residential and commercial settings where safety is a top priority.

While there are features in locks and latches aimed at functions such as keeping doors ajar, assisting in opening doors, or preventing locks from sticking, those purposes do not align with the primary role of an auxiliary latch, which is strictly focused on enhancing security.