* Oxygen (O2): This is the most well-known byproduct, and it's released into the atmosphere.

* Water (H2O): While water is a reactant in photosynthesis, some water is also produced as a byproduct.

It's important to note that while glucose (C6H12O6) is a product of photosynthesis, it is not a byproduct. Glucose is the primary product, the reason photosynthesis occurs in the first place.

Here's a simplified representation of the process:

6CO2 + 6H2O + sunlight energy → C6H12O6 + 6O2

* 6CO2 (Carbon dioxide) is a reactant.

* 6H2O (Water) is a reactant.

* Sunlight energy is the energy source for the reaction.

* C6H12O6 (Glucose) is the primary product.

* 6O2 (Oxygen) is a byproduct.