A suction machine, also known as an aspirator, is a medical device that uses suction to remove obstructions like mucus, blood, or secretions from a person's airway. It maintains a clear airway for individuals unable to clear their own secretions due to lack of consciousness or an ongoing medical procedure. Precautions must be taken when using suction machines to avoid potential complications like hypoxia, airway trauma, infection, or bradycardia.