Transpiration is the process by which plants lose water vapor from their leaves into the atmosphere. This occurs mainly through small openings called stomata, which are found on the surface of leaves. As water evaporates, it creates a negative pressure that helps draw more water and nutrients up from the roots through the xylem. This process is essential for plant health, as it helps regulate temperature and maintain the flow of nutrients. Transpiration also plays a significant role in the water cycle, contributing to moisture in the air and influencing weather patterns.