Now, in competitive inhibition, the inhibitor resembled our substrate. But in non competitive, the inhibitor does not actually resemble our substrate. And that means it does not bind to the active site of the enzyme. It binds to completely different location, known as the allosteric site. Now, since the two sites, the allosteric site and the active site, are different, the inhibitor can bind to the enzyme regardless of whether the substrate is actually bound to our enzyme or not. So if we look at the following diagram, we have the enzyme shown by this brown region.