Enzymes are naturally occurring, protein-based molecules that catalyze (cause or accelerate) the various chemical reactions in all living things. Enzymes are true catalysts in that they are not consumed in the reaction, and each enzyme molecule can catalyze thousands upon thousands of reactions per second. Enzymes are very specific to the reaction that they drive; each type of enzyme does one thing and one thing only. That makes them especially effective tools for achieving specific results in such diverse processes as fiber refining and stickies reduction.