The Calvin cycle is part of photosynthesis, which is how plants make their food. It doesn’t need light directly like the first part of photosynthesis but uses energy made from the light part. The cycle happens inside the chloroplasts of plant cells, specifically in a fluid area called the stroma.Here is how it works: first, a special enzyme called RuBisCO helps take carbon dioxide from the air and attach it to a molecule called RuBP. This process is called carbon fixation. The result breaks into smaller molecules. Next, the cycle uses energy from molecules called ATP and NADPH (which come from the light-dependent reactions) to change those smaller molecules into a sugar called G3P, which plants can use to grow and store energy. Finally, some G3P molecules leave the cycle to eventually form glucose (plant sugar), and others help regenerate RuBP so the cycle can start over again.In simple words, the Calvin cycle is a series of steps plants use to turn carbon dioxide and energy into sugar, keeping the whole process of photosynthesis going[tex].[/tex]