According to Genesis, Noah made a window in the Ark.
Genesis 6:16 includes instructions for making an opening or window for the ark, alongside the roof and the door in its side. After the flood, Genesis 8:6 says that Noah opened this window and sent out a raven. The window therefore serves a practical narrative purpose: it allows Noah to test conditions outside the vessel.
English translations vary in how they render the relevant Hebrew term. “Window,” “opening,” and related wording can appear in different translations, but “window” is the conventional short answer for this question. The text does not call it a skylight in the modern architectural sense.
The opening is distinct from the ark’s door. Genesis 7:16 says that Noah and the animals enter through the door, while Genesis 8 describes Noah using the window to release birds. Popular artwork may show many windows, but the biblical instructions mention the feature in the singular.