The second stage of photosynthesis is called the light-dependent reactions. In this stage, NADPH (nicotinamide adenine dinucleotide phosphate) is produced along with ATP.

Here's a breakdown:

* ATP (adenosine triphosphate) is the primary energy currency of cells.

* NADPH is an electron carrier that will be used in the next stage of photosynthesis (the Calvin cycle) to reduce carbon dioxide.

Let me know if you'd like more information about the light-dependent reactions or the Calvin cycle!