Airflow refers to the movement of air from one place to another. It can occur naturally, such as when wind blows outside, or artificially, like when a fan or air conditioning unit circulates air indoors. Airflow is essential for various processes, including ventilation in buildings, cooling in electronic devices, and even the functioning of aircraft. In many applications, controlling airflow is crucial for efficiency and comfort. For instance, in HVAC systems, proper airflow ensures that spaces are heated or cooled evenly. Additionally, in aerodynamics, understanding airflow helps engineers design vehicles that move smoothly through the air, reducing drag and improving fuel efficiency.