Here's a breakdown:

* Photosynthesis: This is the process where plants, algae, and some bacteria use sunlight, carbon dioxide (CO2), and water (H2O) to create their own food.

* Glucose: This is a simple sugar that acts as the primary energy source for the plant. It's essentially the plant's "food."

While oxygen (O2) is also produced during photosynthesis, it's a byproduct, not the major product.