Here's a breakdown:

* Photosynthesis is the process plants use to convert light energy into chemical energy.

* Glucose is a simple sugar that serves as the primary energy source for plants and other organisms.

* Oxygen is also a product of photosynthesis, but it's a byproduct, not the main product.

So, while oxygen is essential for many living things, glucose is the primary product that the plant uses to grow and function.