Here's a breakdown:

* Substrate: The molecule(s) that an enzyme acts upon.

* Enzyme: A biological catalyst that speeds up a chemical reaction without being consumed in the process.

* Product: The molecule(s) that result from the enzymatic reaction.

Think of it like this:

* Substrate: The ingredients you put into a recipe.

* Enzyme: The chef who cooks the ingredients.

* Product: The delicious dish you get to eat!

For example, the enzyme lactase breaks down the substrate lactose (milk sugar) into the products glucose and galactose.