CAM plants, or Crassulacean Acid Metabolism plants, are a type of plant that have adapted to arid environments. They open their stomata at night to take in carbon dioxide, which helps reduce water loss during the hot daytime. This unique process allows them to thrive in conditions where water is scarce. Common examples of CAM plants include cacti, succulents, and some species of pineapple. By storing the carbon dioxide as an acid overnight, these plants can use it for photosynthesis during the day, making them efficient in conserving water while still producing energy.