Crassulacean Acid Metabolism (CAM) is a photosynthetic process used by some plants, particularly those in arid environments. In CAM, plants open their stomata at night to take in carbon dioxide, which is then stored as malic acid. This adaptation helps reduce water loss during the hot daytime when stomata are typically closed. During the day, the stored malic acid is converted back into carbon dioxide for photosynthesis, allowing the plant to produce energy while minimizing water evaporation. CAM is commonly found in succulents, cacti, and some epiphytic plants, enabling them to thrive in dry conditions.