Why is desorption important for a substance to act as a good catalyst?

(N/A) During a catalytic reaction,reactant molecules are adsorbed on the surface of the catalyst to form products.
For the catalyst to remain effective and continue the reaction,the product molecules must be desorbed from the surface.
This desorption process creates vacant sites on the catalyst surface,allowing new reactant molecules to be adsorbed and undergo the reaction again.