Noninvasive ventilation is a method of delivering respiratory support to patients without the need for invasive procedures such as intubation or tracheostomy. This type of ventilation is typically delivered through a face or nasal mask, and can be used to treat conditions such as chronic obstructive pulmonary disease (COPD), acute respiratory failure, and sleep apnea. Noninvasive ventilation helps to improve oxygenation, reduce respiratory distress, and decrease the need for intubation in some cases. It is considered a less invasive and more comfortable option for patients who require respiratory support.