Enzymatic Reactions

In the presence of the enzyme alcohol dehydrogenase, the rate of reduction of acetaldehyde to ethanol increases as you increase the concentration of the substrate, acetaldehyde. Eventually the rate of the reaction reaches a maximum, where further increases in the concentration of the substrate has no affect on the reaction rate. This kind of event is common to many enzymatic reactions.

Can you please explain in detail what is happening here, so I can better understand it?

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