CAM photosynthesis is a specialized process used by some plants, particularly those in arid environments, to conserve water. The acronym stands for Crassulacean Acid Metabolism. In this method, plants open their stomata at night to take in carbon dioxide, which is then stored as organic acids until daylight. During the day, the stomata close to reduce water loss, and the stored carbon dioxide is released for use in photosynthesis. This adaptation allows CAM plants, such as cacti and succulents, to thrive in conditions where water is scarce, making them efficient in their use of resources.