This conversation provides a summary of volume ventilation and pressure ventilation, including the modes of ventilation used in each. In volume ventilation, the tidal volume is set and does not change, but the peak inspiratory pressure can fluctuate based on changes in airway resistance and alveolar compliance. In pressure ventilation, the peak inspiratory pressure is set and does not change, but the tidal volume can fluctuate based on changes in airway resistance and lung compliance. The conversation also covers the different modes of ventilation, including CMV, AC, SIMV, PC CMV, PC AC, and PC SIMV.