A Ridge Vent is an option to homeowners to ventilate their attic space. A ridge vent is a 2 inch wide strip cut right on the ridge line, giving the most convection type pull of air possible. The ridge of your roof is then roofed over top of the ridge vent, so there is no visible evidence of the ventialtion.
This diagram shows how air enters our home and what hapens in the summer and the winter when air can’t ecscape properly vs. proper ventilation.