A wind tunnel is a controlled environment used to study the effects of air moving over solid objects. It allows engineers and scientists to test the aerodynamic properties of various designs, such as cars, airplanes, and even buildings. By simulating wind conditions, researchers can observe how air flows around these objects, helping to improve their performance and efficiency. In a wind tunnel, a fan generates airflow, while sensors and cameras capture data on how the object interacts with the wind. This information is crucial for industries like aerospace and automotive, where understanding aerodynamics can lead to safer and more efficient designs.