Here's a breakdown:

* Chloroplasts: These are organelles found within plant cells. They are the sites of photosynthesis, the process by which plants convert sunlight into energy.

* Thylakoid membranes: Inside the chloroplasts are stacks of flattened sacs called thylakoids. These membranes contain the chlorophyll molecules.

* Chlorophyll: This is the pigment that absorbs sunlight energy. It is embedded within the thylakoid membranes.

So, the journey of light energy goes:

1. Sunlight enters the leaf

2. Chloroplasts capture the light energy

3. Thylakoid membranes within the chloroplasts hold the chlorophyll

4. Chlorophyll absorbs the light energy

This energy is then used to power the reactions of photosynthesis, ultimately producing sugar (glucose) and oxygen.