Skylights are windows in the roof of a building that let in light.
Skylights are usually good because they bring in natural light and make a room brighter.
Examples:
The skylights in the attic let in the sun.
She likes to look at the stars through the skylights.
The rain comes in through the skylights.
The skylights make the room as bright as day.
The skylights in the museum are as big as swimming pools.
The skylights in the spaceship show the stars.