Why do airplane windows always have a small hole?

Have you ever noticed that little hole at the bottom of airplane windows? This often overlooked detail plays a crucial role in ensuring your safety in flight. If you think it's just a technical curiosity, get ready to discover its importance.
Why a hole in a window?

As the aircraft climbs to high altitudes, the outside air pressure drops sharply. Inside the cabin, however, the air remains pressurized to ensure passenger comfort and safety. This pressure difference could have serious effects on the windows if not properly managed.

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