Maybe both! The differences are slight between a roof window and a skylight. Both let natural light flood into your living spaces and create a sense of expansiveness. A roof window is usually larger - if you can see the sky with a skylight, you can see sky and land with a roof window. Roof windows also serve as an egress in case of fire or to enter a balcony. Skylights are made for roofs with a slope of at least 15 degrees while roof windows can vary from this stricture.
Let us take a look at your roof and see what will work for you. Email us to set up a free consultation.