Ventilation is the process of providing fresh air to indoor spaces in order to maintain a healthy and comfortable environment for occupants. This can involve the exchange of air from the inside to the outside and vice versa, as well as ensuring proper air circulation within a building. Ventilation is important for removing pollutants, odors, and excess moisture from indoor spaces, as well as regulating temperature and humidity levels. Proper ventilation can also help prevent the spread of airborne diseases and improve overall indoor air quality. Research in the field of ventilation often focuses on developing efficient and sustainable ventilation systems, understanding the impact of ventilation on occupant health and well-being, and exploring new technologies and strategies for optimizing indoor air quality.