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A enzyme is a biological catalyst that speeds up a reaction without being used up itself in the end.An enzyme is called a substrate and the substance in which it acts on is called the reactant and you will finally get the result which is called the PRODUCT..
Example of enzymes in our body-amylase(secreted by the mouth and pancreas)
An enzyme is a kind of big, complicated protein molecule, made mainly of hydrogen and carbon atoms, but with some other atoms as well. Both prokaryote and eukaryote cells use enzymes, so the first enzymes probably evolved around four billion years ago, together with the first living things.
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