Definition
A spyhole is identical to a peephole: a small hole or lens in a door to see outside without opening it. It's primarily a security measure, allowing you to identify visitors discreetly. Imagine it as a secret window built into the door πͺ. Spyholes usually provide a one-way view, protecting the resident's privacy. Unlike opening the door, it keeps you safe from potential threats. It's a common feature in apartments and hotels.