It seems like you're discussing the process of enzyme-substrate interaction. In enzymatic reactions, the substrate molecule binds to the active site of the enzyme, forming an enzyme-substrate complex. During the reaction, this complex undergoes a transformation, allowing the substrate to be converted into product(s). After the reaction is complete, the product(s) leave the enzyme's active site, freeing the enzyme to bind to new substrate molecules and catalyze further reactions.
If you have a specific enzyme, reaction, or context in mind, feel free to provide more details!