According to Genesis, a window was built into Noah’s Ark to let in light.
Genesis 6:16 tells Noah to make a “window” or opening for the Ark and to finish the structure to a specified height. Translation choices differ because the underlying Hebrew term and the description of the opening have been interpreted in more than one way.
Some English versions render the feature as a window, while others use terms such as skylight or opening. The text does not describe a modern glass window, and it does not identify a detailed mechanism for opening and closing it.
This feature is distinct from the Ark’s door, which Genesis says was placed in the side. The text also describes three decks and rooms inside the vessel, but it does not provide a complete architectural plan.