What is the difference between dry-bulb temperature and wet-bulb temperature on a psychrometric chart?

Dry-bulb temperature is the temperature of the air measured by a thermometer, whereas wet-bulb temperature is the lowest temperature that can be reached by a thermometer wrapped in a wet cloth and placed in an air stream. The wet-bulb temperature is a measure of the heat and moisture content of the air. On a psychrometric chart, the dry-bulb temperature is plotted on the x-axis, and the wet-bulb temperature is plotted on the y-axis, enabling engineers to visualize the relationship between these two properties.