Also known as the Calvin Cycle
All the reactions of photosynthesis that are not directly dependent upon light are known as the dark reactions. The dark reactions occur whether there is light present or not.
The dark reactions occur in the part of the chloroplast known as the stroma.
The purpose of the dark reactions is to take the energy from ATP and energized electrons and hydrogen ions from NADPH and add them to CO2 to make glucose or sugar.