Here's why:

* Chlorophyll is a green pigment found in plants, algae, and some bacteria. It's the primary molecule responsible for absorbing light energy, specifically in the red and blue wavelengths.

* This absorbed light energy is then used to power the chemical reactions of photosynthesis, which convert carbon dioxide and water into glucose (a simple sugar) and oxygen.

So, chlorophyll acts as the key player in turning light energy into chemical energy stored in sugars.