Ventilation is the process of moving air in and out of a space to ensure fresh air circulation. It helps remove stale air, odors, and pollutants, making indoor environments healthier and more comfortable. Proper ventilation is essential in places like homes, offices, and schools, where people spend a lot of time. There are different types of ventilation systems, including natural and mechanical. Natural ventilation relies on windows and vents to let air flow freely, while mechanical ventilation uses fans and ducts to control air movement. Both methods play a crucial role in maintaining good indoor air quality and regulating temperature.