Lint is created by small fibers that are shed from fabrics during the machine washing and drying process. During the washing process, fibers are pulled to the fabric's surface but remain intact. During the drying process, hot air blows the fibers off of the fabric, and lint is created.
Once the fibers are blown off the fabric, the hot air from the dryer pushes the lint fibers into the dryer's lint trap. It's important to clean the lint trap after each drying cycle, as lint buildup can cause decreased airflow to the motor. When airflow to the motor is blocked, the dryer cannot cool properly, and the risk of fire increases. Decreased airflow can also cause the dryer to work harder, leading to increased wear and tear and higher energy bills.