And Km is basically a constant known as the Michaelis constant. Now, the mechaelis constant basically represents the concentration of the substrate that basically makes sure that exactly half of the active sites are completely filled for that particular enzyme. And at this point, our velocity is given by v one half. So v one half corresponds to the velocity or the rate of activity of the enzyme when exactly half of the active sites of all the enzymes are basically occupied by our substrate. So the point at which exactly half of the enzyme active sites are being used up or are being occupied is given by a constant given by Km known as the Mikhailis constant. At this point, the velocity is given by v one half.