Here's how it works:

* Light-dependent reactions: These reactions capture light energy and use it to:

* Split water molecules, releasing oxygen as a byproduct.

* Produce ATP (adenosine triphosphate), the cell's energy currency.

* Generate NADPH (nicotinamide adenine dinucleotide phosphate), a high-energy electron carrier.

* Calvin cycle (light-independent reactions): These reactions use the energy from ATP and the high-energy electrons from NADPH produced in the light-dependent reactions to:

* Fix carbon dioxide from the atmosphere.

* Convert it into glucose (a sugar), which is the primary energy source for plants and other organisms.

In summary: The light-dependent reactions provide the necessary energy (ATP) and reducing power (NADPH) for the Calvin cycle to synthesize glucose.