Ventilators deliver controlled airflow to assist or replace spontaneous breathing in critical conditions like ARDS, COPD exacerbations, or post-surgical respiratory failure when lungs fail. Advanced models feature multiple modes volume-controlled, pressure support (PSV), non-invasive (NIV), and high-frequency oscillatory for tailored therapy. Key types include ICU ventilators for prolonged support, portable/transport units for mobility, invasive (via ET tubes) for severe cases, and non-invasive (masks/CPAP/BiPAP) for home/clinic use. Integrated alarms detect apnea, high pressure, or disconnects; touchscreen interfaces enable real-time monitoring of tidal volume, PEEP, and FiO2. ISO-compliant, battery-backed designs ensure reliability in ICUs, ambulances, and homecare, enhancing patient outcomes worldwide.