Yawning is a natural reflex that involves opening the mouth wide and inhaling deeply, often followed by a slow exhalation. It is commonly associated with tiredness, boredom, or the need to increase oxygen intake. Yawning can occur in various animals, including humans, and is thought to help regulate brain temperature and alertness. The exact reasons for yawning are still not fully understood, but it is believed to be linked to the body's need for oxygen and the release of certain neurotransmitters. Yawning can also be contagious; seeing or hearing someone yawn may trigger the same response in others, highlighting its social and communicative aspects.