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The purpose of respiration, whether artificial or spontaneous, is to get homeostasis. Mechanical ventilators are electronic, mechanical, or pneumatic devices that are doing respiration automatically according to the process of the parameters that are set by us. In the historical process, the developments in anesthesia and intensive care units have led us to classify these devices according to the actuating mechanism, the use of negative and positive pressure, occurrence of respiratory volume, or according to the ventilation period. However, many modern ventilators are complex devices with a combination of these classifications. In the near future, these devices will turn into smart devices, and all adjustments will be done automatically according to the patient's conditions. [ABSTRACT FROM AUTHOR]