The dryer vent is duct work that runs from your laundry room to the exterior of your home. It is the route that hot air, moisture & lint use to escape your dryer.
A dryer vent system needs to be clear of debris to allow for adequate air flow. When air flow is restricted, the dryer has to work much longer and harder to adequately dry the laundry. It also must work at higher temperatures, which not only damages your clothes, increases your utility bills, and overworks your dryer – it can also easily lead to a house fire.