1. Glucose (sugar): This is the primary product of photosynthesis. It's a simple sugar that plants use for energy and to build other important molecules like cellulose (for cell walls) and starch (for storage).

2. Oxygen (O2): This is a byproduct of photosynthesis. It's released into the atmosphere, and is essential for the respiration of most living organisms.

So, photosynthesis is basically taking in light energy, carbon dioxide, and water, and using them to create glucose and oxygen. It's the foundation of life on Earth, as it provides the energy and building blocks for most ecosystems.