Both C4 plants and CAM plants are for hot and dry environments, except CAM plants are plants that exist where it is impossible to collect carbon dioxide during the day because it'll lose too much water.
C4 plants collect carbon dioxide in the mesophyll cell, circulate it until it becomes oxaloacetate, and then it brings the carbon dioxide into the bundle-sheath cell to start the Calvin cycle.
In CAM plants, the stomata is closed during the day, meaning all the CO2 will have to be collected and stored inside the mesophyll cell, since photosynthesis can only happen during the day. When the day approaches, the stomata closes again, and photosynthesis can start with the carbon dioxide that was stored during the night.
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